50278 + Interview Questions in Physics

1.	Whatisphysics?
Answer» Whatisphysics?

Discussion

2.	Two thin wires each having radius R are placed at a distance d apart with their axes coinciding . The charges on the two rings are +Q and -Q . Find the potential difference between the centres of the two rings.
Answer» Two thin wires each having radius R are placed at a distance d apart with their axes coinciding . The charges on the two rings are +Q and -Q . Find the potential difference between the centres of the two rings.

Discussion

3.	Two gases occupy two containers A and B the gas in A, of volume 0.10m3, exerts a pressure of 1.40 MPa and that in B of volume0.15m3 exerts a pressure 0.7 MPa. The two containers are united by a tube of negligible volume and the gases are allowed to intermingle. Then it the temperature remains constant, the final pressure in the container will be (in MPa)
Answer» Two gases occupy two containers A and B the gas in A, of volume $0.10 m^{3}$ , exerts a pressure of 1.40 MPa and that in B of volume $0.15 m^{3}$ exerts a pressure 0.7 MPa. The two containers are united by a tube of negligible volume and the gases are allowed to intermingle. Then it the temperature remains constant, the final pressure in the container will be (in MPa)

Discussion

4.	White light is incident normally on a glass plate (in air) of thickness 500 nm and refractive index of 1.5. The wavelength (in nm) in the visible region (400 nm - 700 nm) that is strongly reflected by the plate is:
Answer» White light is incident normally on a glass plate (in air) of thickness 500 nm and refractive index of 1.5. The wavelength (in nm) in the visible region (400 nm - 700 nm) that is strongly reflected by the plate is:

Discussion

5.	A solid cylindrical conductor of radius R1 is kept inside a hollow cylindrical conductor of inner radius R2 and outer radius R3(R1<R2<R3) in a co - axial manner, as shown. The solid cylinder carries a current I1 and the hollow conductor carries current I2 in the opposite directions. The two conductors are kept insulated from each other and current through each is distributed uniformly over the cross–section. Let r be any radial distance from the axis. Magnitude of magnetic induction B at points inside the solid conductor, so that r<R1 , can be expressed as
Answer» A solid cylindrical conductor of radius $R_{1}$ is kept inside a hollow cylindrical conductor of inner radius $R_{2}$ and outer radius $R_{3} (R_{1} < R_{2} < R_{3})$ in a co - axial manner, as shown. The solid cylinder carries a current $I_{1}$ and the hollow conductor carries current $I_{2}$ in the opposite directions. The two conductors are kept insulated from each other and current through each is distributed uniformly over the cross–section. Let r be any radial distance from the axis. Magnitude of magnetic induction B at points inside the solid conductor, so that $r < R_{1}$ , can be expressed as

Discussion

6.	The frequency of two side bands in an AM wave are 640KHz and 660 KHz respectively Find the frequency of carried and modulating signal What is the bandwidth required for amplitude modulation
Answer» The frequency of two side bands in an AM wave are 640KHz and 660 KHz respectively Find the frequency of carried and modulating signal What is the bandwidth required for amplitude modulation

Discussion

7.	The electric field in a region is given by →E=(35Eo^i+45Eo^j) N/C. The ratio of flux of reported field through the rectangular surface of area 0.2 m2 (parallel to y−z plane) to that with the surface of area 0.3 m2 (parallel to x−z plane) is a:2, where a=_______.[Here ^i,^j and ^k are unit vectors along x, y and z - axes respectively]
Answer» The electric field in a region is given by $\to E = (\frac{3}{5} E_{o}^i + \frac{4}{5} E_{o}^j) N/C$ . The ratio of flux of reported field through the rectangular surface of area $0.2 m^{2}$ $($ parallel to $y - z$ plane $)$ to that with the surface of area $0.3 m^{2}$ $($ parallel to $x - z$ plane $)$ is $a : 2$ , where $a =$ _______. $[$ Here $^i,^j$ and $^k$ are unit vectors along $x$ , $y$ and $z$ - axes respectively $]$

Discussion

8.	Two conducting rings P and Q of radii r and 2r rotate uniformly in opposite directions with centre of mass velocities 2v and v respectively on a conducting surface S. There is a uniform magnetic field of magnitude B perpendicular to the plane of the rings. The potential difference between the highest points of the two rings is
Answer» Two conducting rings P and Q of radii r and 2r rotate uniformly in opposite directions with centre of mass velocities 2v and v respectively on a conducting surface S. There is a uniform magnetic field of magnitude B perpendicular to the plane of the rings. The potential difference between the highest points of the two rings is

8.

Two conducting rings P and Q of radii r and 2r rotate uniformly in opposite directions with centre of mass velocities 2v and v respectively on a conducting surface S. There is a uniform magnetic field of magnitude B perpendicular to the plane of the rings. The potential difference between the highest points of the two rings is

Answer»

Two conducting rings P and Q of radii r and 2r rotate uniformly in opposite directions with centre of mass velocities 2v and v respectively on a conducting surface S. There is a uniform magnetic field of magnitude B perpendicular to the plane of the rings. The potential difference between the highest points of the two rings is

Discussion

9.	The magnitude of the resultant of two vectors of magnitude 3 units and 4 units in 5 units. What is the angle between the two vectors?
Answer» The magnitude of the resultant of two vectors of magnitude 3 units and 4 units in 5 units. What is the angle between the two vectors?

Discussion

10.	What do you mean by viscosity?
Answer» What do you mean by viscosity?

Discussion

11.	a man throws a ball up with a initial speed u. At a ins†an t it reaches its maximum height H, he throws up another ball with same initialspeed. Two balls will collide at a height.
Answer» a man throws a ball up with a initial speed u. At a ins†an t it reaches its maximum height H, he throws up another ball with same initialspeed. Two balls will collide at a height.

Discussion

12.	The magnitude of electric field intensity at point P (2,0,0) due to a dipole of dipole moment, →p=^i+√3^j kept at origin is -(Assume that the point P is at large distance from the dipole and K=14πϵ0)
Answer» The magnitude of electric field intensity at point $P (2, 0, 0)$ due to a dipole of dipole moment, $\to p =^i + \sqrt{3}^j$ kept at origin is - $($ Assume that the point $P$ is at large distance from the dipole and $K = \frac{1}{4 π ϵ_{0}})$

Discussion

13.	A uniform steel rod of density ρ, cross - sectional area A and length L is suspended so that it hangs vertically. The stress at the middle point of the rod is given by ρgLN. Then, the value of N is
Answer» A uniform steel rod of density $ρ$ , cross - sectional area $A$ and length $L$ is suspended so that it hangs vertically. The stress at the middle point of the rod is given by $\frac{ρ g L}{N}$ . Then, the value of $N$ is

Discussion

14.	What is the Relation b/w alpha gama and beeta??
Answer» What is the Relation b/w alpha gama and beeta??

Discussion

15.	For Bohr’s atomic model of hydrogen and hydrogen like atoms, answer the following questions based on the columns below. Symbols have their usual meanings and, ‘n’ is principal quantum number, z is atomic number of atom. Column 1Column 2Column 3(Physical quanties)(For hydrogen)(For hydrogen like atom)(I)Energy of e−(E)is(i)n3(P)z2n2proportional to(II)Velocity of e− is(ii)n(Q)nzproportional to(III)Time period of revolution(iii)1n2(R)nproportional to(IV)Angular momentum is(iv)1n(s)n3z2proportional to Which of the combination correctly matches with the time period of revolution of electron?
Answer» For Bohr’s atomic model of hydrogen and hydrogen like atoms, answer the following questions based on the columns below. Symbols have their usual meanings and, ‘n’ is principal quantum number, z is atomic number of atom. $\begin{matrix} C o l u m n 1 & C o l u m n 2 & C o l u m n 3 (P h y s i c a l q u a n t i e s) & (F o r h y d r o g e n) & (F o r h y d r o g e n l i k e a t o m) (I) & E n e r g y o f e^{-} (E) i s & (i) & n^{3} & (P) & \frac{z^{2}}{n^{2}} p r o p o r t i o n a l t o (I I) & V e l o c i t y o f e^{-} i s & (i i) & n & (Q) & \frac{n}{z} p r o p o r t i o n a l t o (I I I) & T i m e p e r i o d o f r e v o l u t i o n & (i i i) & \frac{1}{n^{2}} & (R) & n p r o p o r t i o n a l t o (I V) & A n g u l a r m o m e n t u m i s & (i v) & \frac{1}{n} & (s) & \frac{n^{3}}{z^{2}} p r o p o r t i o n a l t o \end{matrix}$ Which of the combination correctly matches with the time period of revolution of electron?

15.

For Bohr’s atomic model of hydrogen and hydrogen like atoms, answer the following questions based on the columns below. Symbols have their usual meanings and, ‘n’ is principal quantum number, z is atomic number of atom. Column 1Column 2Column 3(Physical quanties)(For hydrogen)(For hydrogen like atom)(I)Energy of e−(E)is(i)n3(P)z2n2proportional to(II)Velocity of e− is(ii)n(Q)nzproportional to(III)Time period of revolution(iii)1n2(R)nproportional to(IV)Angular momentum is(iv)1n(s)n3z2proportional to Which of the combination correctly matches with the time period of revolution of electron?

Answer»

For Bohr’s atomic model of hydrogen and hydrogen like atoms, answer the following questions based on the columns below. Symbols have their usual meanings and, ‘n’ is principal quantum number, z is atomic number of atom.

$\begin{matrix} C o l u m n 1 & C o l u m n 2 & C o l u m n 3 (P h y s i c a l q u a n t i e s) & (F o r h y d r o g e n) & (F o r h y d r o g e n l i k e a t o m) (I) & E n e r g y o f e^{-} (E) i s & (i) & n^{3} & (P) & \frac{z^{2}}{n^{2}} p r o p o r t i o n a l t o (I I) & V e l o c i t y o f e^{-} i s & (i i) & n & (Q) & \frac{n}{z} p r o p o r t i o n a l t o (I I I) & T i m e p e r i o d o f r e v o l u t i o n & (i i i) & \frac{1}{n^{2}} & (R) & n p r o p o r t i o n a l t o (I V) & A n g u l a r m o m e n t u m i s & (i v) & \frac{1}{n} & (s) & \frac{n^{3}}{z^{2}} p r o p o r t i o n a l t o \end{matrix}$

Which of the combination correctly matches with the time period of revolution of electron?

Discussion

16.	ntThe resistance of the filament of a lamp increases with the increase in temperature.A lamp rated 100 W and 200 V is connected across 220 V power supply.If the voltage drops by 10 percentage,then the power of the lamp will ben ntA)90 Wn ntB)more than 80 Wn ntC)between 90 and 100 Wn ntD)between 81 and 90 Wn
Answer» ntThe resistance of the filament of a lamp increases with the increase in temperature.A lamp rated 100 W and 200 V is connected across 220 V power supply.If the voltage drops by 10 percentage,then the power of the lamp will ben ntA)90 Wn ntB)more than 80 Wn ntC)between 90 and 100 Wn ntD)between 81 and 90 Wn

Discussion

17.	Two Carnot engines ′A′ and ′B′ are operated in succession. The first one, A receives heat from a source at T1=800 K and rejects to a sink at T2 K . The second engine B receives heat rejected by the first engine and rejects it to the another sink at T3=300 K. If the work outputs of the two engines are equal, then the value of T2 is
Answer» Two Carnot engines $^{'} A^{'}$ and $^{'} B^{'}$ are operated in succession. The first one, $A$ receives heat from a source at $T_{1} = 800 K$ and rejects to a sink at $T_{2} K$ . The second engine $B$ receives heat rejected by the first engine and rejects it to the another sink at $T_{3} = 300 K$ . If the work outputs of the two engines are equal, then the value of $T_{2}$ is

Discussion

18.	A stopping potential of 0.82 V is required to stop the emission of photoelectrons from the surface of a metal by light of wavelength 4000 ˙A. For light of wavelength 3000 ˙A, the stopping potential is 1.85 V. If the value of Planck's constant is 6.6×10−x. What is the value of x?
Answer» A stopping potential of $0.82 V$ is required to stop the emission of photoelectrons from the surface of a metal by light of wavelength $4000 ˙ A$ . For light of wavelength $3000 ˙ A$ , the stopping potential is $1.85 V$ . If the value of Planck's constant is $6.6 \times 10^{- x}$ . What is the value of $x$ ?

Discussion

19.	Angular acceleration is basically an acceleration only, Right? Then why its unit is not m/s^2 ?
Answer» Angular acceleration is basically an acceleration only, Right? Then why its unit is not m/s^2 ?

Discussion

20.	(a) Monochromatic light of wavelength 589 nm is incident from air on a water surface. If p for water is 1.33, find the wavelength, frequency and speed of the refracted light. (b) A double convex lens is made of a glass of refractive index 1.55, with both faces of the same radius of curvature. Find the radius of curvature required, if the focal length is 20 cm.
Answer» (a) Monochromatic light of wavelength 589 nm is incident from air on a water surface. If p for water is 1.33, find the wavelength, frequency and speed of the refracted light. (b) A double convex lens is made of a glass of refractive index 1.55, with both faces of the same radius of curvature. Find the radius of curvature required, if the focal length is 20 cm.

Discussion

21.	From a tower of height H, a particle is thrown vertically upwards with a speed u. The time taken by the particle to hit the ground is n times the time taken by it to reach the highest point of its path. The relation between H, u and n is
Answer» From a tower of height $H$ , a particle is thrown vertically upwards with a speed $u$ . The time taken by the particle to hit the ground is $n$ times the time taken by it to reach the highest point of its path. The relation between $H$ , $u$ and $n$ is

Discussion

22.	what is nature of chargein p type and n type semiconductor
Answer» what is nature of chargein p type and n type semiconductor

Discussion

23.	A screen is at a distance D=80 cm from a diaphragm having two narrow slits, S1 and S2 which are d=2 mm apart. Slit S1 is covered by a transparent sheet of thickness t1=2.5 μm and S2 by another transparent sheet of thickness t2=1.25μm . sheets are made of same material having refractive index μ=1.40. Water is filled in space between diaphragm and screen. A monochromatic light beam of wavelength λ=5000 A∘ is incident normally on the diaphragm. Assuming intensity of beam to be uniform, calculate ratio of intensity of center of screen to intensity of individual slit, (μw=43)
Answer» A screen is at a distance $D = 80 cm$ from a diaphragm having two narrow slits, $S_{1} a n d S_{2}$ which are $d = 2 mm$ apart. Slit $S_{1}$ is covered by a transparent sheet of thickness $t_{1} = 2.5 μ m a n d S_{2}$ by another transparent sheet of thickness $t_{2} = 1.25 μ m$ . sheets are made of same material having refractive index $μ = 1.40$ . Water is filled in space between diaphragm and screen. A monochromatic light beam of wavelength $λ = 5000 A^{\circ}$ is incident normally on the diaphragm. Assuming intensity of beam to be uniform, calculate ratio of intensity of center of screen to intensity of individual slit, $(μ_{w} = \frac{4}{3})$

Discussion

24.	Can volume stress be termed as normal stress because in that case also force is applied normal to the body ?
Answer» Can volume stress be termed as normal stress because in that case also force is applied normal to the body ?

Discussion

25.	what is the smallest unit of charge
Answer» what is the smallest unit of charge

Discussion

26.	Find the moment of inertia of a rectangular bar magnet about an axis passing through its centre and parallel to its thickness. Mass of the magnet is 100 g, length is 12 cm, breadth is 3 cm and thickness is 2 cm.
Answer» Find the moment of inertia of a rectangular bar magnet about an axis passing through its centre and parallel to its thickness. Mass of the magnet is 100 g, length is 12 cm, breadth is 3 cm and thickness is 2 cm.

Discussion

27.	A mass 2 kg is moved from point A to B. If the increase in kinetic energy of mass is 4 J and work done on the mass is −10 J, then potential difference between B and A (J/kg) is
Answer» A mass $2 kg$ is moved from point $A$ to $B$ . If the increase in kinetic energy of mass is $4 J$ and work done on the mass is $- 10 J$ , then potential difference between $B$ and $A$ ( $J/kg$ ) is

Discussion

28.	For the equilibrium situation shown. The strings are strong enough to with stand a maximum tension of 100 N.What is the largest value of W (in N) that they can support as shown?
Answer» For the equilibrium situation shown. The strings are strong enough to with stand a maximum tension of 100 N.What is the largest value of W (in N) that they can support as shown?

Discussion

29.	When is the metre bridge most sensitive?
Answer» When is the metre bridge most sensitive?

Discussion

30.	A rectangular frame ABCD made of a uniform metal wire has a straight connection between E and F made of the same wire as shown in figure. AEFD is a square of side 1 m and EB=FC=0.5 m. The entire circuit is placed in a steadily increasing uniform magnetic field directed into the plane of the paper and normal to it. The rate of change of magnetic field is 1 T s−1. The resistance per unit length of the wire is 1 Ωm−1. Find the magnitude of the current in the segment EF.
Answer» A rectangular frame $ABCD$ made of a uniform metal wire has a straight connection between $E$ and $F$ made of the same wire as shown in figure. $AEFD$ is a square of side $1 m$ and $EB = FC = 0.5 m$ . The entire circuit is placed in a steadily increasing uniform magnetic field directed into the plane of the paper and normal to it. The rate of change of magnetic field is $1 {T s}^{- 1}$ . The resistance per unit length of the wire is $1 Ω m^{- 1}$ . Find the magnitude of the current in the segment $EF$ .

Discussion

31.	) Both (2) & (3)44. A car moves on a circular path such that its speedis given by v 4t, where t is time in seconds. Ifradius of the circular path is 2 m, the accelerationof the car at time t 2 s is(1) 4/65 m/s(3) 30 m/s?(2) 32 m/s2(4) 4v35 m/s245. Two balls are simultaneously projected horizontallywith speeds 4 m/s and 3 m/s respectively inopposite direction from top of a tower of height80 m. The distance between two balls when they hitthe ground is (g 10 m/s2)(1) 16 m(3) 28 m(2) 12 m(4) 4 mTRY
Answer» ) Both (2) & (3)44. A car moves on a circular path such that its speedis given by v 4t, where t is time in seconds. Ifradius of the circular path is 2 m, the accelerationof the car at time t 2 s is(1) 4/65 m/s(3) 30 m/s?(2) 32 m/s2(4) 4v35 m/s245. Two balls are simultaneously projected horizontallywith speeds 4 m/s and 3 m/s respectively inopposite direction from top of a tower of height80 m. The distance between two balls when they hitthe ground is (g 10 m/s2)(1) 16 m(3) 28 m(2) 12 m(4) 4 mTRY

Discussion

32.	Energy shared in cylindrical region of length l extending from radius R1 to R2 and coaxial with long wire carrying current i is
Answer» Energy shared in cylindrical region of length l extending from radius $R_{1}$ to $R_{2}$ and coaxial with long wire carrying current i is

Discussion

33.	A person trying to lose weight (dieter) lifts a 10 kg mass, one thousand times, to a height of 0.5 m each time. Assume that the potential energy lost each time she lowers the mass is dissipated. (a) How much work does she do against the gravitational force ? (b) Fat supplies 3.8 × 107J of energy per kilogram which is converted to mechanical energy with a 20% efficiency rate. How much fat will the dieter use up?
Answer» A person trying to lose weight (dieter) lifts a 10 kg mass, one thousand times, to a height of 0.5 m each time. Assume that the potential energy lost each time she lowers the mass is dissipated. (a) How much work does she do against the gravitational force ? (b) Fat supplies 3.8 × 107J of energy per kilogram which is converted to mechanical energy with a 20% efficiency rate. How much fat will the dieter use up?

Discussion

34.	Two parallel plate capacitors A and B having capacitances 3 μF and 15 μF are charged seperately upto 10 V and 20 V respectively. Now positive plate of A is connected to the negative plate of B and vice-versa. Find how much heat produced in the circuit?
Answer» Two parallel plate capacitors $A$ and $B$ having capacitances $3 μ F$ and $15 μ F$ are charged seperately upto $10 V$ and $20 V$ respectively. Now positive plate of $A$ is connected to the negative plate of $B$ and vice-versa. Find how much heat produced in the circuit?

Discussion

35.	Gaseous iodine molecule dissociate into atoms by absorbing a photon of frequency 200 cycles/second calculate the energy required to dissociate 1 molecule Iodine 2
Answer» Gaseous iodine molecule dissociate into atoms by absorbing a photon of frequency 200 cycles/second calculate the energy required to dissociate 1 molecule Iodine 2

Discussion

36.	29A bird flies for 4 sec with a velocity v=\|t-2\| m/s along a straihgt line , where t is time in second. it travels a distance equal to 1. 2m 2. 4m 3. 6m 4. 8m
Answer» 29A bird flies for 4 sec with a velocity v=\|t-2\| m/s along a straihgt line , where t is time in second. it travels a distance equal to 1. 2m 2. 4m 3. 6m 4. 8m

Discussion

37.	nth harmonic of a closed organ pipe is equal to mth harmonic of an open pipe. First overtone frequency of the closed organ pipe is also equal to first overtone frequency of the open organ pipe. Find the value of n if m = 6? ___
Answer» $n^{t h}$ harmonic of a closed organ pipe is equal to $m^{t h}$ harmonic of an open pipe. First overtone frequency of the closed organ pipe is also equal to first overtone frequency of the open organ pipe. Find the value of n if m = 6? ___

Discussion

38.	Is the speed of electricity is 3 * 108 m/s
Answer» Is the speed of electricity is 3 * 10⁸m/s

Discussion

39.	A very small groove is made in the earth, anda particle of mass mo is placed at R/2 distance from the centreas shown is figure. Find the escape energy of the particle fromthat place.
Answer» A very small groove is made in the earth, anda particle of mass mo is placed at R/2 distance from the centreas shown is figure. Find the escape energy of the particle fromthat place.

Discussion

40.	each of two large conducting parallel plates has one sided surface area is a if one of the plate is given charge Q there as the other is neutral then the electric field at a point in between the flat is given by
Answer» each of two large conducting parallel plates has one sided surface area is a if one of the plate is given charge Q there as the other is neutral then the electric field at a point in between the flat is given by

Discussion

41.	What is the expression for maximum current in resonant LC circuit ?
Answer» What is the expression for maximum current in resonant LC circuit ?

Discussion

42.	Two plates of the same area and the same thickness having thermal conductivities k1 and k2 are placed one on top of the other. The top and bottom faces of the composite plate are maintained at different constant temperatures. The thermal conductivity of the composite plate will be
Answer» Two plates of the same area and the same thickness having thermal conductivities $k_{1}$ and $k_{2}$ are placed one on top of the other. The top and bottom faces of the composite plate are maintained at different constant temperatures. The thermal conductivity of the composite plate will be

Discussion

43.	A cubical body floats on mercury with 4 % of its volume below the mercury surface. What fraction of the volume of the body will be immersed in the mercury if a layer of water poured on top of the mercury covers the body completely? [Assume, ρm=13.6 g/cm3 ; ρw=1 g/cm3 ]
Answer» A cubical body floats on mercury with $4 %$ of its volume below the mercury surface. What fraction of the volume of the body will be immersed in the mercury if a layer of water poured on top of the mercury covers the body completely? [Assume, $ρ_{m} = 13.6 {g/cm}^{3}; ρ_{w} = 1 {g/cm}^{3}$ ]

Discussion

44.	A modu action frequency an AM radio station is 250 kHz, which is 10% of the carrier wave. If another AM station approaches you for license, what broadcast frequency will you allot ?
Answer» A modu action frequency an AM radio station is $250 kHz$ , which is $10 %$ of the carrier wave. If another AM station approaches you for license, what broadcast frequency will you allot ?

Discussion

45.	the rate of diong work by a force acting on a pafrticle moving along x axis depends on position x of particle and is equal to 2x . The velocity of particle is given by the expression'
Answer» the rate of diong work by a force acting on a pafrticle moving along x axis depends on position x of particle and is equal to 2x . The velocity of particle is given by the expression'

Discussion

46.	A body stats falling from height 'h' and travel distance h/2 during last sec of motion then time of travel ( in sec)
Answer» A body stats falling from height 'h' and travel distance h/2 during last sec of motion then time of travel ( in sec)

Discussion

47.	A unit vector parallel to the resultant of the vectors →A=^i+4^j−2^k and →B=3^i−5^j+^k is
Answer» A unit vector parallel to the resultant of the vectors $\to A =^i + 4^j - 2^k$ and $\to B = 3^i - 5^j +^k$ is

Discussion

48.	A metal plate of area 1×10−4m2 is illuminated by a radiation of intensity 16 mW/m2 . The work function of the metal is 5 eV. The energy of the incident photons is 10 eV and only 10% of it produces photo electrons. The number of emitted photo electrons per second and their maximum energy respectively, will be[1eV=1.6×10−19J]
Answer» A metal plate of area $1 \times 10^{- 4} m^{2}$ is illuminated by a radiation of intensity $16 {mW/m}^{2}$ . The work function of the metal is $5 eV$ . The energy of the incident photons is $10 eV$ and only $10 %$ of it produces photo electrons. The number of emitted photo electrons per second and their maximum energy respectively, will be $[1 eV = 1.6 \times 10^{- 19} J]$

Discussion

49.	4 balls of same mass throws from a tower of hieght è 20metre ,one of them just drop, 2nd throws with 30m/sec with30degree horizontal 3rd ball thrws horizontally with 30metre/sec and 4th ball throws with 30metre/ sec downward with 30degree which ball reach first in th groun
Answer» 4 balls of same mass throws from a tower of hieght è 20metre ,one of them just drop, 2nd throws with 30m/sec with30degree horizontal 3rd ball thrws horizontally with 30metre/sec and 4th ball throws with 30metre/ sec downward with 30degree which ball reach first in th groun

Discussion

50.	What is maximum number of rectangular components into which a vector can be split in its own plane
Answer» What is maximum number of rectangular components into which a vector can be split in its own plane

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Whatisphysics?

Two thin wires each having radius R are placed at a distance d apart with their axes coinciding . The charges on the two rings are +Q and -Q . Find the potential difference between the centres of the two rings.

White light is incident normally on a glass plate (in air) of thickness 500 nm and refractive index of 1.5. The wavelength (in nm) in the visible region (400 nm - 700 nm) that is strongly reflected by the plate is:

The frequency of two side bands in an AM wave are 640KHz and 660 KHz respectively Find the frequency of carried and modulating signal What is the bandwidth required for amplitude modulation

The magnitude of the resultant of two vectors of magnitude 3 units and 4 units in 5 units. What is the angle between the two vectors?

What do you mean by viscosity?

a man throws a ball up with a initial speed u. At a ins†an t it reaches its maximum height H, he throws up another ball with same initialspeed. Two balls will collide at a height.

The magnitude of electric field intensity at point P (2,0,0) due to a dipole of dipole moment, →p=^i+√3^j kept at origin is -(Assume that the point P is at large distance from the dipole and K=14πϵ0)

A uniform steel rod of density ρ, cross - sectional area A and length L is suspended so that it hangs vertically. The stress at the middle point of the rod is given by ρgLN. Then, the value of N is

What is the Relation b/w alpha gama and beeta??

A stopping potential of 0.82 V is required to stop the emission of photoelectrons from the surface of a metal by light of wavelength 4000 ˙A. For light of wavelength 3000 ˙A, the stopping potential is 1.85 V. If the value of Planck's constant is 6.6×10−x. What is the value of x?

Angular acceleration is basically an acceleration only, Right? Then why its unit is not m/s^2 ?

From a tower of height H, a particle is thrown vertically upwards with a speed u. The time taken by the particle to hit the ground is n times the time taken by it to reach the highest point of its path. The relation between H, u and n is

what is nature of chargein p type and n type semiconductor

Can volume stress be termed as normal stress because in that case also force is applied normal to the body ?

what is the smallest unit of charge

Find the moment of inertia of a rectangular bar magnet about an axis passing through its centre and parallel to its thickness. Mass of the magnet is 100 g, length is 12 cm, breadth is 3 cm and thickness is 2 cm.

A mass 2 kg is moved from point A to B. If the increase in kinetic energy of mass is 4 J and work done on the mass is −10 J, then potential difference between B and A (J/kg) is

For the equilibrium situation shown. The strings are strong enough to with stand a maximum tension of 100 N.What is the largest value of W (in N) that they can support as shown?

When is the metre bridge most sensitive?

Energy shared in cylindrical region of length l extending from radius R1 to R2 and coaxial with long wire carrying current i is

Two parallel plate capacitors A and B having capacitances 3 μF and 15 μF are charged seperately upto 10 V and 20 V respectively. Now positive plate of A is connected to the negative plate of B and vice-versa. Find how much heat produced in the circuit?

Gaseous iodine molecule dissociate into atoms by absorbing a photon of frequency 200 cycles/second calculate the energy required to dissociate 1 molecule Iodine 2

29A bird flies for 4 sec with a velocity v=|t-2| m/s along a straihgt line , where t is time in second. it travels a distance equal to 1. 2m 2. 4m 3. 6m 4. 8m

nth harmonic of a closed organ pipe is equal to mth harmonic of an open pipe. First overtone frequency of the closed organ pipe is also equal to first overtone frequency of the open organ pipe. Find the value of n if m = 6? ___

Is the speed of electricity is 3 * 108 m/s

A very small groove is made in the earth, anda particle of mass mo is placed at R/2 distance from the centreas shown is figure. Find the escape energy of the particle fromthat place.

each of two large conducting parallel plates has one sided surface area is a if one of the plate is given charge Q there as the other is neutral then the electric field at a point in between the flat is given by

What is the expression for maximum current in resonant LC circuit ?

Two plates of the same area and the same thickness having thermal conductivities k1 and k2 are placed one on top of the other. The top and bottom faces of the composite plate are maintained at different constant temperatures. The thermal conductivity of the composite plate will be

A cubical body floats on mercury with 4 % of its volume below the mercury surface. What fraction of the volume of the body will be immersed in the mercury if a layer of water poured on top of the mercury covers the body completely? [Assume, ρm=13.6 g/cm3 ; ρw=1 g/cm3 ]

A modu action frequency an AM radio station is 250 kHz, which is 10% of the carrier wave. If another AM station approaches you for license, what broadcast frequency will you allot ?

the rate of diong work by a force acting on a pafrticle moving along x axis depends on position x of particle and is equal to 2x . The velocity of particle is given by the expression'

A body stats falling from height 'h' and travel distance h/2 during last sec of motion then time of travel ( in sec)

A unit vector parallel to the resultant of the vectors →A=^i+4^j−2^k and →B=3^i−5^j+^k is

4 balls of same mass throws from a tower of hieght è 20metre ,one of them just drop, 2nd throws with 30m/sec with30degree horizontal 3rd ball thrws horizontally with 30metre/sec and 4th ball throws with 30metre/ sec downward with 30degree which ball reach first in th groun

What is maximum number of rectangular components into which a vector can be split in its own plane