50278 + Interview Questions in Physics

1.	22. The end P and Q of an inextensible string move downwards with uniform speed u. Pulleys A and B are fixed. The mass M moves upwards with a speed
Answer» 22. The end P and Q of an inextensible string move downwards with uniform speed u. Pulleys A and B are fixed. The mass M moves upwards with a speed

Discussion

2.	(p) A small solid cylinder of radius r and mass M slides down a smooth hill of height h from rest and gets onto the plank of mass M lying on the smooth horizontal plane at the base of the hill as shown in the figure. Due to friction between the cylinder and plank, the cylinder slows down and starts rolling without friction over the plank. While the cylinder is rolling (without sliding) over the plank, the velocity of the plank is vp, the velocity of centre of mass of the cylinder is vc and angular velocity of the cylinder is “ω”. The coefficient of friction between the cylinder and plank is , while gravity (g) is uniform in the space. [Assume that height of the plank is negligible.] The minimum length of the plank required for pure rolling of the cylinder over the plank is
Answer» (p) A small solid cylinder of radius r and mass M slides down a smooth hill of height h from rest and gets onto the plank of mass M lying on the smooth horizontal plane at the base of the hill as shown in the figure. Due to friction between the cylinder and plank, the cylinder slows down and starts rolling without friction over the plank. While the cylinder is rolling (without sliding) over the plank, the velocity of the plank is $v_{p}$ , the velocity of centre of mass of the cylinder is $v_{c}$ and angular velocity of the cylinder is “ $ω$ ”. The coefficient of friction between the cylinder and plank is , while gravity (g) is uniform in the space. [Assume that height of the plank is negligible.] The minimum length of the plank required for pure rolling of the cylinder over the plank is

Discussion

3.	State clearly how an unpolarised light gets linearly polarised when passed through a polaroid. (i) Unpolarised light of intensity I0 is incident on a polaroid P1 which is kept near another polaroid P2 whose pass axis is parallel to that of P1. How will the intensities of light, I1 and I2, transmitted by the polaroids P1 and P2 respectively, change on rotating P1 without disturbing P2? (ii) Write the relation between the intensities I1 and I2.
Answer» State clearly how an unpolarised light gets linearly polarised when passed through a polaroid. (i) Unpolarised light of intensity $I_{0}$ is incident on a polaroid $P_{1}$ which is kept near another polaroid $P_{2}$ whose pass axis is parallel to that of $P_{1}$ . How will the intensities of light, $I_{1}$ and $I_{2}$ , transmitted by the polaroids $P_{1}$ and $P_{2}$ respectively, change on rotating $P_{1}$ without disturbing $P_{2}$ ? (ii) Write the relation between the intensities $I_{1}$ and $I_{2}$ .

Discussion

4.	14. A 1 L vessel containing 1g H2 gas at 27^° C is connected to a 2 L vessel containing 88 g CO2, also at 27^° C. When the Gases are completely mixed total pressure is?
Answer» 14. A 1 L vessel containing 1g H2 gas at 27^° C is connected to a 2 L vessel containing 88 g CO2, also at 27^° C. When the Gases are completely mixed total pressure is?

Discussion

5.	The SI unit of magnetic flux is
Answer» The SI unit of magnetic flux is

Discussion

6.	A bead moves outwards with constant speed ‘u’ along the spoke of a wheel and wheel rotating about its axis with constant angular velocity ‘ω’. The bead leaves the centre of the wheel at t = 0. The velocity of the bead as a function of time is given by (where ^er and ^et are unit vectors along radial and tangential directions, respectively)
Answer» A bead moves outwards with constant speed ‘u’ along the spoke of a wheel and wheel rotating about its axis with constant angular velocity ‘ω’. The bead leaves the centre of the wheel at t = 0. The velocity of the bead as a function of time is given by (where ${^e}_{r}$ and ${^e}_{t}$ are unit vectors along radial and tangential directions, respectively)

Discussion

7.	A uniform magnetic field exists in space as b=4icap.the magnetic flux through an area s=(2icap+4jcap)is
Answer» A uniform magnetic field exists in space as b=4icap.the magnetic flux through an area s=(2icap+4jcap)is

Discussion

8.	Refractive index of thin prism is 1.5 and refracting angle isdegree. Focal length of lens is 60 cm. They co-ordinates of converging point of beam is equal to
Answer» Refractive index of thin prism is 1.5 and refracting angle isdegree. Focal length of lens is 60 cm. They co-ordinates of converging point of beam is equal to

8.

Refractive index of thin prism is 1.5 and refracting angle isdegree. Focal length of lens is 60 cm. They co-ordinates of converging point of beam is equal to

Answer»

Refractive index of thin prism is 1.5 and refracting angle isdegree. Focal length of lens is 60 cm. They co-ordinates of converging point of beam is equal to

Discussion

9.	A block at rest explodes into three equal parts.Two parts atart moving along X and Y axes respectively with equal parts of 10 m/s.Find the velocity of the third part.
Answer» A block at rest explodes into three equal parts.Two parts atart moving along X and Y axes respectively with equal parts of 10 m/s.Find the velocity of the third part.

9.

A block at rest explodes into three equal parts.Two parts atart moving along X and Y axes respectively with equal parts of 10 m/s.Find the velocity of the third part.

Answer»

A block at rest explodes into three equal parts.Two parts atart moving along X and Y axes respectively with equal parts of 10 m/s.Find the velocity of the third part.

Discussion

10.	4.A particle of unit mass undergoes one-dimensionalmotion such that its velocity varies according toy(x) Ben, where β and n are constants and x is theposition of the particle. The acceleration of the particleas a function of x, is given by\lbrack AIPMT-2015)(2) -2η β 2X-2n-1(4) -22 x-2n+ 1(1) -2n2 e4n+ 1
Answer» 4.A particle of unit mass undergoes one-dimensionalmotion such that its velocity varies according toy(x) Ben, where β and n are constants and x is theposition of the particle. The acceleration of the particleas a function of x, is given by\lbrack AIPMT-2015)(2) -2η β 2X-2n-1(4) -22 x-2n+ 1(1) -2n2 e4n+ 1

Discussion

11.	does the electric field produced by a charge change when it is moving:-1)uniform motion 2)accelerated motion
Answer» does the electric field produced by a charge change when it is moving:-1)uniform motion 2)accelerated motion

Discussion

12.	A 400 kg satellite is placed in earth's orbit at 3600 km above the surface. What is the orbital speed of the satellite? (R=6400 km) (go=10 m/s2)
Answer» A $400 k g$ satellite is placed in earth's orbit at $3600 k m$ above the surface. What is the orbital speed of the satellite? $(R = 6400 k m) (g_{o} = 10 m / s^{2})$

Discussion

13.	A body is moving uniformly in a straight line with a velocity of 10 m/s.What is the dis†an ce covered by it in 10s? ( calculate it with the help of velocity versus time graph).
Answer» A body is moving uniformly in a straight line with a velocity of 10 m/s.What is the dis†an ce covered by it in 10s? ( calculate it with the help of velocity versus time graph).

Discussion

14.	The dimensions of angular momentum is.
Answer» The dimensions of angular momentum is.

Discussion

15.	Given thatand.What can you conclude about the vectors?
Answer» Given that and. What can you conclude about the vectors?

Discussion

16.	An infinite long straight wire is bent into a semicircle of radius R, as shown in the figure. A current I is sent through the conductor. The magnetic field at the centre of the semicircle is:
Answer» An infinite long straight wire is bent into a semicircle of radius R, as shown in the figure. A current I is sent through the conductor. The magnetic field at the centre of the semicircle is:

Discussion

17.	the velocity time graph of a particle moving along a straiht line the displacement of the particle in 5 second
Answer» the velocity time graph of a particle moving along a straiht line the displacement of the particle in 5 second

Discussion

18.	An object o is kept in air in front of a thin plano-convex lens of radius of curvature 10cm it's refractive index is 3/2 and medium towards right of plane surface is water of refractive index 4/3.what should be the distance x of the object so that the ray becomes parallel finally?
Answer» An object o is kept in air in front of a thin plano-convex lens of radius of curvature 10cm it's refractive index is 3/2 and medium towards right of plane surface is water of refractive index 4/3.what should be the distance x of the object so that the ray becomes parallel finally?

Discussion

19.	Two masses M1 and M2 are connected by a string constant k and are placed on a smooth horizontal surface.Initially the spring is stretched through a distance 'd' when the system is released from rest.find the distance moved by the two masses when the spring is compressed by a distance 'd'.
Answer» Two masses M1 and M2 are connected by a string constant k and are placed on a smooth horizontal surface.Initially the spring is stretched through a distance 'd' when the system is released from rest.find the distance moved by the two masses when the spring is compressed by a distance 'd'.

Discussion

20.	terminals of 18 V battery with internal resistance 24 ohm are connected to circular wire of resistance 24 ohm at two points distant at one quarter of circumference of circular wire , current through bigger arc of circle is0.75 A1.5 A2.25 A3 A
Answer» terminals of 18 V battery with internal resistance 24 ohm are connected to circular wire of resistance 24 ohm at two points distant at one quarter of circumference of circular wire , current through bigger arc of circle is 0.75 A 1.5 A 2.25 A 3 A

Discussion

21.	If the energy in the first excited state in hydrogen atomis 23.8 eV then the potential energy and kinetic energ of a hydrogenatom in the ground state can be assumed to be(1) 10 eV(3) 13.6 eV(2) 23.3 eV(4) Zero
Answer» If the energy in the first excited state in hydrogen atomis 23.8 eV then the potential energy and kinetic energ of a hydrogenatom in the ground state can be assumed to be(1) 10 eV(3) 13.6 eV(2) 23.3 eV(4) Zero

Discussion

22.	An extended horizontal object AB is placed in front of a plane mirror inclined at 45∘ with horizontal as shown in the figure. The image of AB in plane mirror will look like:
Answer» An extended horizontal object $A B$ is placed in front of a plane mirror inclined at $45^{\circ}$ with horizontal as shown in the figure. The image of $A B$ in plane mirror will look like:

Discussion

23.	The segment AB of wire carrying current I1 is placed perpendicular to a long straight wire carrying current I2 as shown in figure. The magnitude of force experienced by straight wire AB is:
Answer» The segment $AB$ of wire carrying current $I_{1}$ is placed perpendicular to a long straight wire carrying current $I_{2}$ as shown in figure. The magnitude of force experienced by straight wire $AB$ is:

Discussion

24.	An important spectral emission line has a wavelength of 21 cm. The corresponding photon energy is(h=6.62×10−34Js; c=3×108m/s)
Answer» An important spectral emission line has a wavelength of 21 cm. The corresponding photon energy is $(h = 6.62 \times 10^{- 34} J s$ ; $c = 3 \times 10^{8} m / s)$

Discussion

25.	The acceleration of a particle is increasing linearly with time t as bt. The particle starts from rest from the origin. The velocity will be proportional to
Answer» The acceleration of a particle is increasing linearly with time $t$ as $b t$ . The particle starts from rest from the origin. The velocity will be proportional to

Discussion

26.	What is the weight of a body at a depth equal to half the radius of earth, if it weighs 250 N on the surface of earth?
Answer» What is the weight of a body at a depth equal to half the radius of earth, if it weighs $250 N$ on the surface of earth?

Discussion

27.	Bakelite is an example of:
Answer» Bakelite is an example of:

Discussion

28.	A proton and an α− particle, having kinetic energies Kp and Kα respectively, enter into a magnetic field at right angles. The ratio of the radii of trajectory of proton to that of α− particle is 2:1. The ratio Kp:Kα will be :
Answer» A proton and an $α -$ particle, having kinetic energies $K_{p}$ and $K_{α}$ respectively, enter into a magnetic field at right angles. The ratio of the radii of trajectory of proton to that of $α -$ particle is $2 : 1$ . The ratio $K_{p} : K_{α}$ will be :

Discussion

29.	A thin metal disc of radius 0.25 m and mass 2 kg starts from rest and rolls down an inclined plane. If its rotational kinetic energy is 4 J at the foot of the inclined plane, then the liner velocity at the same point is
Answer» A thin metal disc of radius 0.25 m and mass 2 kg starts from rest and rolls down an inclined plane. If its rotational kinetic energy is 4 J at the foot of the inclined plane, then the liner velocity at the same point is

Discussion

30.	Is Wheatstone bridge balance equation valid if Capacitors are used in place of resistors ? ( C1/C2 =C3/C4)
Answer» Is Wheatstone bridge balance equation valid if Capacitors are used in place of resistors ? ( C1/C2 =C3/C4)

Discussion

31.	The Kα and Kβ X -rays of molybdenum have wavelengths 0.71 A∘ and 0.63 A∘ respectively. Find the wavelength of Lα X-ray of molybdenum.
Answer» The $K_{α}$ and $K_{β}$ X -rays of molybdenum have wavelengths 0.71 $A^{\circ}$ and 0.63 $A^{\circ}$ respectively. Find the wavelength of $L_{α}$ X-ray of molybdenum.

Discussion

32.	A particle of mass m is located in a unidimensional potential field where potential energy of the particle depends on the coordinate x as U(x) = A/x^2 - B/x where A and B are positive cons†an ts. Find the time period of small oscillations that the particle perform about equilibrium position .
Answer» A particle of mass m is located in a unidimensional potential field where potential energy of the particle depends on the coordinate x as U(x) = A/x^2 - B/x where A and B are positive cons†an ts. Find the time period of small oscillations that the particle perform about equilibrium position .

Discussion

33.	What is the relation between meter and fermi ?
Answer» What is the relation between meter and fermi ?

Discussion

34.	The velocity vector at a point A varies with time as v=ai cap +btj cap,where a and b are positive constants. What would be the equation of trajectory of the point ?
Answer» The velocity vector at a point A varies with time as v=ai cap +btj cap,where a and b are positive constants. What would be the equation of trajectory of the point ?

Discussion

35.	If kinetic energy of an object is increased by 4 %, then its momentum will increase by
Answer» If kinetic energy of an object is increased by 4 %, then its momentum will increase by

Discussion

36.	In the figure shown below, two identical balls of mass M and radius R each, are placed in contact with each other on the frictionless horizontal surface. The third ball of mass M and radius R/2, is coming down vertically and has a velocity v0 when it hits the two balls symmetrically and itself comes to rest. Then, each of the two bigger balls will move after collision with a speed equal to
Answer» In the figure shown below, two identical balls of mass $M$ and radius $R$ each, are placed in contact with each other on the frictionless horizontal surface. The third ball of mass $M$ and radius $R / 2$ , is coming down vertically and has a velocity $v_{0}$ when it hits the two balls symmetrically and itself comes to rest. Then, each of the two bigger balls will move after collision with a speed equal to

36.

In the figure shown below, two identical balls of mass M and radius R each, are placed in contact with each other on the frictionless horizontal surface. The third ball of mass M and radius R/2, is coming down vertically and has a velocity v0 when it hits the two balls symmetrically and itself comes to rest. Then, each of the two bigger balls will move after collision with a speed equal to

Answer»

In the figure shown below, two identical balls of mass $M$ and radius $R$ each, are placed in contact with each other on the frictionless horizontal surface. The third ball of mass $M$ and radius $R / 2$ , is coming down vertically and has a velocity $v_{0}$ when it hits the two balls symmetrically and itself comes to rest. Then, each of the two bigger balls will move after collision with a speed equal to

Discussion

37.	what is the difference between rectilinear motion and one dimensional motion
Answer» what is the difference between rectilinear motion and one dimensional motion

Discussion

38.	A piezoelectric transducer having capacitance of 1nF and leakage resistance of 1012 Ω is connected to a parallel load ZL. ZL comprises of 1 MΩ resistance (RL) and 0.5 nF capacitance (C1) in parallel. What will be the approximate value of load voltage VL at very high frequency for 1nC of charge?
Answer» A piezoelectric transducer having capacitance of 1nF and leakage resistance of $10^{12} Ω$ is connected to a parallel load $Z_{L} .$ $Z_{L}$ comprises of $1 M Ω$ resistance $(R_{L})$ and 0.5 nF capacitance $(C_{1})$ in parallel. What will be the approximate value of load voltage $V_{L}$ at very high frequency for 1nC of charge?

Discussion

39.	The initial velocity of a particle moving along a straight line is 5m/s and its retardation is 1m/s^2. The dis†an ce moved by the particle in fourth second of it's motion is (1) 12.5 m (2) 16.4 m (3) 5.6 m (4) 1.5
Answer» The initial velocity of a particle moving along a straight line is 5m/s and its retardation is 1m/s^2. The dis†an ce moved by the particle in fourth second of it's motion is (1) 12.5 m (2) 16.4 m (3) 5.6 m (4) 1.5

Discussion

40.	A ball of mass mb=2 kg having initial velocity of vb=3 m/s hits a ballistic pendulum of mass ma=4 kg and stick to it. When the ball hits the pendulum it swings up from the equilibrium position and rises up as shown in figure. If length of the pendulum thread is l=0.1 m, find maximum deflection of thread with vertical(θ).
Answer» A ball of mass $m_{b} = 2 kg$ having initial velocity of $v_{b} = 3 m/s$ hits a ballistic pendulum of mass $m_{a} = 4 kg$ and stick to it. When the ball hits the pendulum it swings up from the equilibrium position and rises up as shown in figure. If length of the pendulum thread is $l = 0.1 m$ , find maximum deflection of thread with vertical $(θ)$ .

Discussion

41.	The coefficient of linear expansion of brass and steel are α1 and α2. If we take a brass rod of length L1 and steel rod of length L2 at 0∘C, their difference in length (L2−L1) will remain the same at any temperature if
Answer» The coefficient of linear expansion of brass and steel are $α_{1}$ and $α_{2}$ . If we take a brass rod of length $L_{1}$ and steel rod of length $L_{2}$ at $0^{\circ} C$ , their difference in length $(L_{2} - L_{1})$ will remain the same at any temperature if

Discussion

42.	a positive charge q is enclosed by a Gausian surface of radius 'a' .if its radius is increased to 4a then net outward flux will?
Answer» a positive charge q is enclosed by a Gausian surface of radius 'a' .if its radius is increased to 4a then net outward flux will?

Discussion

43.	why is the direction of area vector for 3d shapes taken as outward and perpendicular
Answer» why is the direction of area vector for 3d shapes taken as outward and perpendicular

Discussion

44.	The work function of a metal is hν0. Light of frequency ν falls on this metal. The photoelectric effect will take place only if ν ν0.
Answer» The work function of a metal is $h ν_{0}$ . Light of frequency $ν$ falls on this metal. The photoelectric effect will take place only if $ν$ $ν_{0}$ .

Discussion

45.	A ball of mass 5 kg moving at speed 2 m/s makes a head on collision with an identical ball at rest. The velocities of the balls after the perfectly elastic collision between them are respectively:-
Answer» A ball of mass $5 kg$ moving at speed $2 m/s$ makes a head on collision with an identical ball at rest. The velocities of the balls after the perfectly elastic collision between them are respectively:-

Discussion

46.	One mole of a perfect gas in a cylinder fitted with a piston has a pressure P, volume V and temperature T. If the temperature is increased by 1 K keeping pressure constant, the increase in volume is
Answer» One mole of a perfect gas in a cylinder fitted with a piston has a pressure P, volume V and temperature T. If the temperature is increased by 1 K keeping pressure constant, the increase in volume is

Discussion

47.	Given that, the mass per unit length of the wire is 0.02 kg/m and it has a length of 0.2 m between pulleys. Volume of block is 1200m3 and its mass is 10 kg. If the wire is gently tapped in vertical direction half-way between the pulleys, what is the lowest frequency at which it will vibrate transversely?
Answer» Given that, the mass per unit length of the wire is $0.02 k g / m$ and it has a length of $0.2 m$ between pulleys. Volume of block is $\frac{1}{200} m^{3}$ and its mass is $10 k g$ . If the wire is gently tapped in vertical direction half-way between the pulleys, what is the lowest frequency at which it will vibrate transversely?

Discussion

48.	The time taken by a body to slide down a rough 30∘ inclined plane is twice of that required to slide down a smooth 30∘ inclined plane. The coefficient of kinetic friction between the object and the rough plane is given by
Answer» The time taken by a body to slide down a rough $30^{\circ}$ inclined plane is twice of that required to slide down a smooth $30^{\circ}$ inclined plane. The coefficient of kinetic friction between the object and the rough plane is given by

Discussion

49.	The measure of mass and volume of a body are 2.00 g and 5.0 cm3 respectively, with possibleerrors of 0.01 g and 0.1 cm3. What would be the maximum permissible error in its density?
Answer» The measure of mass and volume of a body are 2.00 g and 5.0 cm3 respectively, with possibleerrors of 0.01 g and 0.1 cm3. What would be the maximum permissible error in its density?

Discussion

50.	A ball of mass 50 g is dropped from a height of 20 m. A boy on the ground hits this ball vertically upward with a bat with an average force of 200 N so that it attains a vertical height of 45 m. The time for which the ball remains in contact with this bat is [Take g=10 m/s2]
Answer» A ball of mass $50 g$ is dropped from a height of $20 m$ . A boy on the ground hits this ball vertically upward with a bat with an average force of $200 N$ so that it attains a vertical height of $45 m$ . The time for which the ball remains in contact with this bat is $[$ Take $g = 10 {m/s}^{2}]$

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

22. The end P and Q of an inextensible string move downwards with uniform speed u. Pulleys A and B are fixed. The mass M moves upwards with a speed

14. A 1 L vessel containing 1g H2 gas at 27^° C is connected to a 2 L vessel containing 88 g CO2, also at 27^° C. When the Gases are completely mixed total pressure is?

The SI unit of magnetic flux is

A uniform magnetic field exists in space as b=4icap.the magnetic flux through an area s=(2icap+4jcap)is

Refractive index of thin prism is 1.5 and refracting angle isdegree. Focal length of lens is 60 cm. They co-ordinates of converging point of beam is equal to

A block at rest explodes into three equal parts.Two parts atart moving along X and Y axes respectively with equal parts of 10 m/s.Find the velocity of the third part.

does the electric field produced by a charge change when it is moving:-1)uniform motion 2)accelerated motion

A 400 kg satellite is placed in earth's orbit at 3600 km above the surface. What is the orbital speed of the satellite? (R=6400 km) (go=10 m/s2)

A body is moving uniformly in a straight line with a velocity of 10 m/s.What is the dis†an ce covered by it in 10s? ( calculate it with the help of velocity versus time graph).

The dimensions of angular momentum is.

Given thatand.What can you conclude about the vectors?

An infinite long straight wire is bent into a semicircle of radius R, as shown in the figure. A current I is sent through the conductor. The magnetic field at the centre of the semicircle is:

the velocity time graph of a particle moving along a straiht line the displacement of the particle in 5 second

An object o is kept in air in front of a thin plano-convex lens of radius of curvature 10cm it's refractive index is 3/2 and medium towards right of plane surface is water of refractive index 4/3.what should be the distance x of the object so that the ray becomes parallel finally?

Two masses M1 and M2 are connected by a string constant k and are placed on a smooth horizontal surface.Initially the spring is stretched through a distance 'd' when the system is released from rest.find the distance moved by the two masses when the spring is compressed by a distance 'd'.

terminals of 18 V battery with internal resistance 24 ohm are connected to circular wire of resistance 24 ohm at two points distant at one quarter of circumference of circular wire , current through bigger arc of circle is0.75 A1.5 A2.25 A3 A

If the energy in the first excited state in hydrogen atomis 23.8 eV then the potential energy and kinetic energ of a hydrogenatom in the ground state can be assumed to be(1) 10 eV(3) 13.6 eV(2) 23.3 eV(4) Zero

An extended horizontal object AB is placed in front of a plane mirror inclined at 45∘ with horizontal as shown in the figure. The image of AB in plane mirror will look like:

The segment AB of wire carrying current I1 is placed perpendicular to a long straight wire carrying current I2 as shown in figure. The magnitude of force experienced by straight wire AB is:

An important spectral emission line has a wavelength of 21 cm. The corresponding photon energy is(h=6.62×10−34Js; c=3×108m/s)

The acceleration of a particle is increasing linearly with time t as bt. The particle starts from rest from the origin. The velocity will be proportional to

What is the weight of a body at a depth equal to half the radius of earth, if it weighs 250 N on the surface of earth?

Bakelite is an example of:

A proton and an α− particle, having kinetic energies Kp and Kα respectively, enter into a magnetic field at right angles. The ratio of the radii of trajectory of proton to that of α− particle is 2:1. The ratio Kp:Kα will be :

A thin metal disc of radius 0.25 m and mass 2 kg starts from rest and rolls down an inclined plane. If its rotational kinetic energy is 4 J at the foot of the inclined plane, then the liner velocity at the same point is

Is Wheatstone bridge balance equation valid if Capacitors are used in place of resistors ? ( C1/C2 =C3/C4)

The Kα and Kβ X -rays of molybdenum have wavelengths 0.71 A∘ and 0.63 A∘ respectively. Find the wavelength of Lα X-ray of molybdenum.

A particle of mass m is located in a unidimensional potential field where potential energy of the particle depends on the coordinate x as U(x) = A/x^2 - B/x where A and B are positive cons†an ts. Find the time period of small oscillations that the particle perform about equilibrium position .

What is the relation between meter and fermi ?

The velocity vector at a point A varies with time as v=ai cap +btj cap,where a and b are positive constants. What would be the equation of trajectory of the point ?

If kinetic energy of an object is increased by 4 %, then its momentum will increase by

what is the difference between rectilinear motion and one dimensional motion

A piezoelectric transducer having capacitance of 1nF and leakage resistance of 1012 Ω is connected to a parallel load ZL. ZL comprises of 1 MΩ resistance (RL) and 0.5 nF capacitance (C1) in parallel. What will be the approximate value of load voltage VL at very high frequency for 1nC of charge?

The initial velocity of a particle moving along a straight line is 5m/s and its retardation is 1m/s^2. The dis†an ce moved by the particle in fourth second of it's motion is (1) 12.5 m (2) 16.4 m (3) 5.6 m (4) 1.5

The coefficient of linear expansion of brass and steel are α1 and α2. If we take a brass rod of length L1 and steel rod of length L2 at 0∘C, their difference in length (L2−L1) will remain the same at any temperature if

a positive charge q is enclosed by a Gausian surface of radius 'a' .if its radius is increased to 4a then net outward flux will?

why is the direction of area vector for 3d shapes taken as outward and perpendicular

The work function of a metal is hν0. Light of frequency ν falls on this metal. The photoelectric effect will take place only if ν ν0.

A ball of mass 5 kg moving at speed 2 m/s makes a head on collision with an identical ball at rest. The velocities of the balls after the perfectly elastic collision between them are respectively:-

One mole of a perfect gas in a cylinder fitted with a piston has a pressure P, volume V and temperature T. If the temperature is increased by 1 K keeping pressure constant, the increase in volume is

The time taken by a body to slide down a rough 30∘ inclined plane is twice of that required to slide down a smooth 30∘ inclined plane. The coefficient of kinetic friction between the object and the rough plane is given by

The measure of mass and volume of a body are 2.00 g and 5.0 cm3 respectively, with possibleerrors of 0.01 g and 0.1 cm3. What would be the maximum permissible error in its density?

A ball of mass 50 g is dropped from a height of 20 m. A boy on the ground hits this ball vertically upward with a bat with an average force of 200 N so that it attains a vertical height of 45 m. The time for which the ball remains in contact with this bat is [Take g=10 m/s2]