50278 + Interview Questions in Physics

1.	Two projectiles are thrown simultaneously in the same plane from the same point. If their velocities are v1 and v2 at angles θ1 and θ2 respectively from the horizontal, then answer the following questions: If v1 = v2 and θ1>θ, then choose the incorrect statement
Answer» Two projectiles are thrown simultaneously in the same plane from the same point. If their velocities are $v_{1}$ and $v_{2}$ at angles $θ_{1}$ and $θ_{2}$ respectively from the horizontal, then answer the following questions: If $v_{1}$ = $v_{2}$ and $θ_{1} > θ$ , then choose the incorrect statement

Discussion

2.	if the proton and alpha particle accelerated through the same potential difference and their velocity perpendicular to their fields ,then the ratio of radii of their path will be?
Answer» if the proton and alpha particle accelerated through the same potential difference and their velocity perpendicular to their fields ,then the ratio of radii of their path will be?

Discussion

3.	When a shell in motion suddenly explodes in mid air the centre of mass of the fragments moves
Answer» When a shell in motion suddenly explodes in mid air the centre of mass of the fragments moves

Discussion

4.	If y=eacos−1x,−1≤x≤1, show that (1−x2)d2ydx2−xdydx−a2y=0
Answer» If $y = e^{a {cos}^{- 1} x}, - 1 \leq x \leq 1,$ show that $(1 - x^{2}) \frac{d^{2} y}{d x^{2}} - x \frac{d y}{d x} - a^{2} y = 0$

Discussion

5.	[CPMT 1986, 88]
Answer» [CPMT 1986, 88]

Discussion

6.	Explain the elastic collision in two dimensions.
Answer» Explain the elastic collision in two dimensions.

Discussion

7.	35. A body is thrown vertically upward with 45m/s .Distance travelled by the body in 5th second is (g=10m/s*2)? 1.1.25m 2.2.5m 3.zero 4.5m
Answer» 35. A body is thrown vertically upward with 45m/s .Distance travelled by the body in 5th second is (g=10m/s*2)? 1.1.25m 2.2.5m 3.zero 4.5m

Discussion

8.	An infinite line charge of uniform electric charge density λ lies along the axis electrically conducting infinite cylindrical shell of radius R. At time t=0, the space in the cylinder is filled with a material of permittivity ε and electrical conductivity σ. The electrical conduction in the material follows Ohm's law. Which one of the following best describes the subsequent variation of the magnitude of current density j(t) at any point in the material?
Answer» An infinite line charge of uniform electric charge density $λ$ lies along the axis electrically conducting infinite cylindrical shell of radius $R .$ At time $t = 0,$ the space in the cylinder is filled with a material of permittivity $ε$ and electrical conductivity $σ .$ The electrical conduction in the material follows Ohm's law. Which one of the following best describes the subsequent variation of the magnitude of current density $j (t)$ at any point in the material?

Discussion

9.	When both the amplitude and the frequency of a sinusoidal message signal are doubled,the modulation index will be doubled in1. Amplitude modulation2. Frequency modulation3. Phase ModulationSelect the correct answer using the codes given below:
Answer» $When both the amplitude and the frequency of a sinusoidal message signal are doubled, the modulation index will be doubled in 1. Amplitude modulation 2. Frequency modulation 3. Phase Modulation Select the correct answer using the codes given below:$

Discussion

10.	A particle is projected from a tower of height 2 mabove ground with speed 3 m/s. Neglect any airresistance to the particle's motion. Maximumhorizontal distance from the foot of the tower wherethe particle can reach is (Takeg 10 m/s)
Answer» A particle is projected from a tower of height 2 m above ground with speed 3 m/s. Neglect any air resistance to the particle's motion. Maximum horizontal distance from the foot of the tower where the particle can reach is (Takeg 10 m/s)

Discussion

11.	What is the angle between (→P+→Q) and (→P×→Q)
Answer» What is the angle between $(\to P + \to Q)$ and $(\to P \times \to Q)$

Discussion

12.	47 In a H2 fuel cell 67.2 litre of hydrogen is used at STP for 15 minutes determine the current generated ??
Answer» 47 In a H2 fuel cell 67.2 litre of hydrogen is used at STP for 15 minutes determine the current generated ??

Discussion

13.	Choose the correct alternative from the clues given at the end of the each statement: (a) The size of the atom in Thomson’s model is .......... the atomic size in Rutherford’s model. (much greater than/no different from/much less than.) (b) In the ground state of .......... electrons are in stable equilibrium, while in .......... electrons always experience a net force. (Thomson’s model/ Rutherford’s model.) (c) A classical atom based on .......... is doomed to collapse.(Thomson’s model/ Rutherford’s model.) (d) An atom has a nearly continuous mass distribution in a ..........but has a highly non-uniform mass distribution in ..........(Thomson’s model/ Rutherford’s model.) (e) The positively charged part of the atom possesses most of the mass in .......... (Rutherford’s model/both the models.)
Answer» Choose the correct alternative from the clues given at the end of the each statement: (a) The size of the atom in Thomson’s model is .......... the atomic size in Rutherford’s model. (much greater than/no different from/much less than.) (b) In the ground state of .......... electrons are in stable equilibrium, while in .......... electrons always experience a net force. (Thomson’s model/ Rutherford’s model.) (c) A classical atom based on .......... is doomed to collapse.(Thomson’s model/ Rutherford’s model.) (d) An atom has a nearly continuous mass distribution in a ..........but has a highly non-uniform mass distribution in ..........(Thomson’s model/ Rutherford’s model.) (e) The positively charged part of the atom possesses most of the mass in .......... (Rutherford’s model/both the models.)

Discussion

14.	Find sin 22.5°
Answer» Find sin 22.5°

Discussion

15.	If y=x3, then d2ydx2 is
Answer» If $y = x^{3}$ , then $\frac{d^{2} y}{d x^{2}}$ is

Discussion

16.	The phase change in reflected wave, when light wave suffers reflection at the interface from air to glass is
Answer» The phase change in reflected wave, when light wave suffers reflection at the interface from air to glass is

Discussion

17.	1. What's the relationship between 1 volt. & 1 esu. ?2. What's meant by the electromotive force aap aise 1.5 volt. ?
Answer» 1. What's the relationship between 1 volt. & 1 esu. ? 2. What's meant by the electromotive force aap aise 1.5 volt. ?

Discussion

18.	What is hybridaigatio and resonance
Answer» What is hybridaigatio and resonance

Discussion

19.	Consider a thin spherical shell of radius R with its centre at origin, carrying a uniform positive charge. The variation of electric field →E(r) and electric potential V(r) with radial distance r from the centre is given by
Answer» Consider a thin spherical shell of radius $R$ with its centre at origin, carrying a uniform positive charge. The variation of electric field $\to E (r)$ and electric potential $V (r)$ with radial distance $r$ from the centre is given by

Discussion

20.	In YDSE, the distance between two slits are 0.03mm and distance between slits and the screen is 1.5m. If the fourth bright fringe is formed at a distance 1cm from the central bright fringe, then find the wavelength of the light used .
Answer» In YDSE, the distance between two slits are 0.03mm and distance between slits and the screen is 1.5m. If the fourth bright fringe is formed at a distance 1cm from the central bright fringe, then find the wavelength of the light used .

Discussion

21.	A potentiometer wire is 100 cm long and a constant potential difference is maintained across it. Two cells are connected in series ﬁrst to support one another and then in opposite direction. The balance points are obtained at 50cm and 10cm from the positive end of the wire in the two cases. The ratio of emf's is:
Answer» A potentiometer wire is 100 cm long and a constant potential difference is maintained across it. Two cells are connected in series ﬁrst to support one another and then in opposite direction. The balance points are obtained at 50cm and 10cm from the positive end of the wire in the two cases. The ratio of emf's is:

Discussion

22.	Derive a relation for a rotation of a body rolling down an inclined plane without slippingORDerive a relation for to gravity with altitude and depth both casesORDevice a relation for centripetal acceleration.
Answer» Derive a relation for a rotation of a body rolling down an inclined plane without slipping OR Derive a relation for to gravity with altitude and depth both cases OR Device a relation for centripetal acceleration.

Discussion

23.	A block of mass m is at rest on a rough wedge of angle θ as shown. What is the force exerted by the wedge on the block?
Answer» A block of mass $m$ is at rest on a rough wedge of angle $θ$ as shown. What is the force exerted by the wedge on the block?

Discussion

24.	A biconvex lens in air has radii of curvature 20 cm each. If the refractive index of the material of the lens is 1.5, what is its focal length?
Answer» A biconvex lens in air has radii of curvature $20 c m$ each. If the refractive index of the material of the lens is $1.5$ , what is its focal length?

Discussion

25.	A base plate of 460×400 mm is to be provided below a column section ISHB 300 576.83 N/m. The bearing pressure from concrete below the base plate is 8.8N/mm2. The suitable thickness of the base plate will be[Take, bf=250mm,tf=10.6mm,tw=7.6mm,γm0=1.1,fy=250 MPa]
Answer» A base plate of $460 \times 400 m m$ is to be provided below a column section ISHB 300 576.83 N/m. The bearing pressure from concrete below the base plate is $8.8 N / m m^{2}$ . The suitable thickness of the base plate will be [Take, $b_{f} = 250 mm, t_{f} = 10.6 mm, t_{w} = 7.6 mm, γ_{m 0} = 1.1, f_{y} = 250 MPa]$

Discussion

26.	A parallel plate capacitor of capacitance 100 μF is connected to a power supply of 200 V. A dielectric slab of dielectric constant 5 is now inserted into the gap between the plates. The workdone by power supply will be:
Answer» A parallel plate capacitor of capacitance $100 μ F$ is connected to a power supply of $200 V$ . A dielectric slab of dielectric constant $5$ is now inserted into the gap between the plates. The workdone by power supply will be:

Discussion

27.	Consider the following system. Assuming that the first image is formed after reflection from mirror M1, the x−co-ordinate of the final image formed by reflection from the mirror M2, if P2 is taken as origin will be
Answer» Consider the following system. Assuming that the first image is formed after reflection from mirror $M_{1}$ , the $x -$ co-ordinate of the final image formed by reflection from the mirror $M_{2}$ , if $P_{2}$ is taken as origin will be

Discussion

28.	Obtain the equivalent capacitance of the network in Fig. 2.35. For a300 V supply, determine the charge and voltage across each capacitor.
Answer» Obtain the equivalent capacitance of the network in Fig. 2.35. For a300 V supply, determine the charge and voltage across each capacitor.

Discussion

29.	A silver sphere of radius 1 cm and work function 4.7 eV is suspended from an insulating thread in free space. It is under continuous illumination of 200 nm wavelength light. As photoelectrons are emitted, the sphere gets charged and acquires a potential. The maximum number of photoelectrons emitted from the sphere are A×10z where 1<A<10. Then the value of z is
Answer» A silver sphere of radius $1 c m$ and work function $4.7 e V$ is suspended from an insulating thread in free space. It is under continuous illumination of $200 n m$ wavelength light. As photoelectrons are emitted, the sphere gets charged and acquires a potential. The maximum number of photoelectrons emitted from the sphere are $A \times 10^{z}$ where $1 < A < 10$ . Then the value of $z$ is

Discussion

30.	if the potential at the surface of a uniform sphere of mass M and radius R is 0,then potential at its centre would be
Answer» if the potential at the surface of a uniform sphere of mass M and radius R is 0,then potential at its centre would be

Discussion

31.	The electric potential at the centre of hemisphere of radius R having uniform surface charge density σ is
Answer» The electric potential at the centre of hemisphere of radius $R$ having uniform surface charge density $σ$ is

Discussion

32.	A cobalt target (atomic no =27) is bombarded with electrons and the wavelength of its characteristic X−ray spectrum are measured. A second weak characteristic spectrum is also found, due to presence of an impurity in the target. The wavelengths of the Kα lines are 225 pm for cobalt and 100 pm for impurity. If the atomic number of impurity is 5N, find the value of N.
Answer» A cobalt target $($ atomic no $= 27)$ is bombarded with electrons and the wavelength of its characteristic $X -$ ray spectrum are measured. A second weak characteristic spectrum is also found, due to presence of an impurity in the target. The wavelengths of the $K_{α}$ lines are $225 pm$ for cobalt and $100 pm$ for impurity. If the atomic number of impurity is $5 N$ , find the value of $N$ .

Discussion

33.	Consider the following circuit:When A = 1, B = 0, the output Y will be
Answer» Consider the following circuit: When A = 1, B = 0, the output Y will be

Discussion

34.	A 100 kg block is dropped from the top of a building 80 m tall. Assume g=10 ms−2. Find the work done by the force of gravity as it falls vertically to hit the ground.
Answer» A $100 kg$ block is dropped from the top of a building $80 m$ tall. Assume $g = 10 {ms}^{- 2}$ . Find the work done by the force of gravity as it falls vertically to hit the ground.

Discussion

35.	an object is launched at a velocity of 20m/s in a direction making an angle of 45degree upward with the horizontal 1) what is the maximum height reached by the object b) what is the total flight time of the object
Answer» an object is launched at a velocity of 20m/s in a direction making an angle of 45degree upward with the horizontal 1) what is the maximum height reached by the object b) what is the total flight time of the object

Discussion

36.	A child and a man are standing in front of a plane mirror as shown in the figure. What should be the minimum height of the mirror so that the child can completely see his/her own image as well as the man's image in the mirror.
Answer» A child and a man are standing in front of a plane mirror as shown in the figure. What should be the minimum height of the mirror so that the child can completely see his/her own image as well as the man's image in the mirror.

Discussion

37.	What is svedberg unit?
Answer» What is svedberg unit?

Discussion

38.	For the given charge distribution, the net electric field at the centre of the non-conducting ring is
Answer» For the given charge distribution, the net electric field at the centre of the non-conducting ring is

Discussion

39.	Let a total charge 2Q be distributed in a sphere of radius R, with the charge density given by ρ(r)=kr, where r is the distance from the centre. Two charges A and B, of −Q each, are placed on diametrically opposite points, at equal distance a, from the centre. If A and B do not experience any force, then
Answer» Let a total charge $2 Q$ be distributed in a sphere of radius $R$ , with the charge density given by $ρ (r) = k r$ , where $r$ is the distance from the centre. Two charges $A$ and $B$ , of $- Q$ each, are placed on diametrically opposite points, at equal distance $a$ , from the centre. If $A$ and $B$ do not experience any force, then

Discussion

40.	A light rod of length l has two masses m1 and m2 attached to its two ends. The moment of inertia of the system about an axis perpendicular to the rod and passing through the centre of mass is
Answer» A light rod of length $l$ has two masses $m_{1}$ and $m_{2}$ attached to its two ends. The moment of inertia of the system about an axis perpendicular to the rod and passing through the centre of mass is

Discussion

41.	The mass suspended to the spring is pulled down by 5 cm from equilibrium and released. the mass will oscillate with an amplitude of
Answer» The mass suspended to the spring is pulled down by 5 cm from equilibrium and released. the mass will oscillate with an amplitude of

Discussion

42.	Figure shows a plane wavefront refracted from air to water using Huygen's principle. The refractive index of water with respect to air is given by,
Answer» Figure shows a plane wavefront refracted from air to water using Huygen's principle. The refractive index of water with respect to air is given by,

Discussion

43.	What is the density of N2 gas at 227°C and 5.00 atm pressure? (R=0.082 L atm K–1 mol–1)
Answer» What is the density of $N_{2}$ gas at $227 ° C$ and $5.00 atm$ pressure? ( $R = 0.082 {L atm K}^{- 1} {mol}^{- 1}$ )

Discussion

44.	What is the centre of mass of a uniform semi circular lamina?
Answer» What is the centre of mass of a uniform semi circular lamina?

Discussion

45.	An electromagnetic wave going through vacuum is described byE=E0sin (kx−ωt)B=B0sin (kx−ωt).Which of the following is true ?
Answer» An electromagnetic wave going through vacuum is described by $E = E_{0} sin (k x - ω t)$ $B = B_{0} sin (k x - ω t)$ . Which of the following is true ?

Discussion

46.	{1000mL of a gas }A at }600 torr and }500ml of gas }}{B at }800 torr are placed in }2L flask. The final }} pressure will be }{ (1) }2000 torr }}{ (2) }1000 torr }}{ (3) }500 torr }}{ (4) }0.5 atm
Answer» {1000mL of a gas }A at }600 torr and }500ml of gas }}{B at }800 torr are placed in }2L flask. The final }} pressure will be }{ (1) }2000 torr }}{ (2) }1000 torr }}{ (3) }500 torr }}{ (4) }0.5 atm

Discussion

47.	A convex mirror is placed in the path of the converging rays at a distance of 30 cm infront of the point of convergence. If the reflected rays appear to diverge from a point 1.2 m from the mirror, find its focal length.
Answer» A convex mirror is placed in the path of the converging rays at a distance of $30 cm$ infront of the point of convergence. If the reflected rays appear to diverge from a point $1.2 m$ from the mirror, find its focal length.

Discussion

48.

An alternating L−C−R circuit is shown in figure, then match the column : (Here symbols have their usual meaning) Column-I Column-II (A). If ωL1−1C1ω=R1, and ωL2−1ωC2=R2(1). I1 and I2 are in same Phase.(B). If ωL1−1C1ω=R1, and 1ωC2−ωL2=R2(2). I=I1+I2 where , I1 , I2 , I3 are RMS value of currents.(C). If capacitor C1 and inductor L2 are removed from circuit and ωL1=R1 ; 1ωC2=R2(3). Magnitude of phase difference between I1 and I2 is π2(D). If capacitors C1 and C2 are both removed from the circuit and ωL1=R1 ; ωL2=R2(4). I=√(I1)2+(I2)2 where, I1 , I2 , I3 are RMS value of currents.(5). I1 is lags and I2 is leads from source voltage.

Answer»

An alternating $L - C - R$ circuit is shown in figure, then match the column : (Here symbols have their usual meaning)

Column-I
Column-II

$(A) .$ If $ω L_{1} - \frac{1}{C_{1} ω} = R_{1}$ , and $ω L_{2} - \frac{1}{ω C_{2}} = R_{2}$	$(1) .$ $I_{1}$ and $I_{2}$ are in same Phase.
$(B) .$ If $ω L_{1} - \frac{1}{C_{1} ω} = R_{1}$ , and $\frac{1}{ω C_{2}} - ω L_{2} = R_{2}$	$(2) .$ $I = I_{1} + I_{2}$ where , $I_{1}, I_{2}, I_{3}$ are RMS value of currents.
$(C) .$ If capacitor $C_{1}$ and inductor $L_{2}$ are removed from circuit and $ω L_{1} = R_{1}; \frac{1}{ω C_{2}} = R_{2}$	$(3) .$ Magnitude of phase difference between $I_{1}$ and $I_{2}$ is $\frac{π}{2}$
$(D) .$ If capacitors $C_{1}$ and $C_{2}$ are both removed from the circuit and $ω L_{1} = R_{1}; ω L_{2} = R_{2}$	$(4) .$ $I = \sqrt{{(I_{1})}_{1}^{2} + {(I_{2})}_{2}^{2}}$ where, $I_{1}, I_{2}, I_{3}$ are RMS value of currents.
$(5) .$ $I_{1}$ is lags and $I_{2}$ is leads from source voltage.

Discussion

49.	Light is what type of wave?
Answer» Light is what type of wave?

Discussion

50.	If the current density in a linear conductor of radius a varies with r according to relation J=kr2 where, k is a constant and r is the distance of a point from the axis of conductor. Find the magnetic field induction at a point distance r from the axis when r<a. Assume relative permeability of the conductor to be unity.
Answer» If the current density in a linear conductor of radius $a$ varies with $r$ according to relation $J = k r^{2}$ where, $k$ is a constant and $r$ is the distance of a point from the axis of conductor. Find the magnetic field induction at a point distance $r$ from the axis when $r < a$ . Assume relative permeability of the conductor to be unity.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Two projectiles are thrown simultaneously in the same plane from the same point. If their velocities are v1 and v2 at angles θ1 and θ2 respectively from the horizontal, then answer the following questions: If v1 = v2 and θ1&gt;θ, then choose the incorrect statement

if the proton and alpha particle accelerated through the same potential difference and their velocity perpendicular to their fields ,then the ratio of radii of their path will be?

When a shell in motion suddenly explodes in mid air the centre of mass of the fragments moves

If y=eacos−1x,−1≤x≤1, show that (1−x2)d2ydx2−xdydx−a2y=0

[CPMT 1986, 88]

Explain the elastic collision in two dimensions.

35. A body is thrown vertically upward with 45m/s .Distance travelled by the body in 5th second is (g=10m/s*2)? 1.1.25m 2.2.5m 3.zero 4.5m

When both the amplitude and the frequency of a sinusoidal message signal are doubled,the modulation index will be doubled in1. Amplitude modulation2. Frequency modulation3. Phase ModulationSelect the correct answer using the codes given below:

A particle is projected from a tower of height 2 mabove ground with speed 3 m/s. Neglect any airresistance to the particle's motion. Maximumhorizontal distance from the foot of the tower wherethe particle can reach is (Takeg 10 m/s)

What is the angle between (→P+→Q) and (→P×→Q)

47 In a H2 fuel cell 67.2 litre of hydrogen is used at STP for 15 minutes determine the current generated ??

Find sin 22.5°

If y=x3, then d2ydx2 is

The phase change in reflected wave, when light wave suffers reflection at the interface from air to glass is

1. What's the relationship between 1 volt. & 1 esu. ?2. What's meant by the electromotive force aap aise 1.5 volt. ?

What is hybridaigatio and resonance

Consider a thin spherical shell of radius R with its centre at origin, carrying a uniform positive charge. The variation of electric field →E(r) and electric potential V(r) with radial distance r from the centre is given by

In YDSE, the distance between two slits are 0.03mm and distance between slits and the screen is 1.5m. If the fourth bright fringe is formed at a distance 1cm from the central bright fringe, then find the wavelength of the light used .

Derive a relation for a rotation of a body rolling down an inclined plane without slippingORDerive a relation for to gravity with altitude and depth both casesORDevice a relation for centripetal acceleration.

A block of mass m is at rest on a rough wedge of angle θ as shown. What is the force exerted by the wedge on the block?

A biconvex lens in air has radii of curvature 20 cm each. If the refractive index of the material of the lens is 1.5, what is its focal length?

A base plate of 460×400 mm is to be provided below a column section ISHB 300 576.83 N/m. The bearing pressure from concrete below the base plate is 8.8N/mm2. The suitable thickness of the base plate will be[Take, bf=250mm,tf=10.6mm,tw=7.6mm,γm0=1.1,fy=250 MPa]

A parallel plate capacitor of capacitance 100 μF is connected to a power supply of 200 V. A dielectric slab of dielectric constant 5 is now inserted into the gap between the plates. The workdone by power supply will be:

Consider the following system. Assuming that the first image is formed after reflection from mirror M1, the x−co-ordinate of the final image formed by reflection from the mirror M2, if P2 is taken as origin will be

Obtain the equivalent capacitance of the network in Fig. 2.35. For a300 V supply, determine the charge and voltage across each capacitor.

if the potential at the surface of a uniform sphere of mass M and radius R is 0,then potential at its centre would be

The electric potential at the centre of hemisphere of radius R having uniform surface charge density σ is

Consider the following circuit:When A = 1, B = 0, the output Y will be

A 100 kg block is dropped from the top of a building 80 m tall. Assume g=10 ms−2. Find the work done by the force of gravity as it falls vertically to hit the ground.

an object is launched at a velocity of 20m/s in a direction making an angle of 45degree upward with the horizontal 1) what is the maximum height reached by the object b) what is the total flight time of the object

A child and a man are standing in front of a plane mirror as shown in the figure. What should be the minimum height of the mirror so that the child can completely see his/her own image as well as the man's image in the mirror.

What is svedberg unit?

For the given charge distribution, the net electric field at the centre of the non-conducting ring is

A light rod of length l has two masses m1 and m2 attached to its two ends. The moment of inertia of the system about an axis perpendicular to the rod and passing through the centre of mass is

The mass suspended to the spring is pulled down by 5 cm from equilibrium and released. the mass will oscillate with an amplitude of

Figure shows a plane wavefront refracted from air to water using Huygen's principle. The refractive index of water with respect to air is given by,

What is the density of N2 gas at 227°C and 5.00 atm pressure? (R=0.082 L atm K–1 mol–1)

What is the centre of mass of a uniform semi circular lamina?

An electromagnetic wave going through vacuum is described byE=E0sin (kx−ωt)B=B0sin (kx−ωt).Which of the following is true ?

{1000mL of a gas }A at }600 torr and }500ml of gas }}{B at }800 torr are placed in }2L flask. The final }} pressure will be }{ (1) }2000 torr }}{ (2) }1000 torr }}{ (3) }500 torr }}{ (4) }0.5 atm

A convex mirror is placed in the path of the converging rays at a distance of 30 cm infront of the point of convergence. If the reflected rays appear to diverge from a point 1.2 m from the mirror, find its focal length.

Light is what type of wave?

Two projectiles are thrown simultaneously in the same plane from the same point. If their velocities are v1 and v2 at angles θ1 and θ2 respectively from the horizontal, then answer the following questions: If v1 = v2 and θ1>θ, then choose the incorrect statement