50278 + Interview Questions in Physics

1.	The capacity of a discrete lossless channel, with 3 input symbols and 5 output symbols, is ______bits/symbol.1.585
Answer» The capacity of a discrete lossless channel, with 3 input symbols and 5 output symbols, is ______bits/symbol. 1.585

Discussion

2.	a charged metallic bob of mass m,ch^° arge Q makes an 60^° with vertical of lenght l is in equilibrium in presemce of electric repulsionby Q(fixd at emean position.what is Q
Answer» a charged metallic bob of mass m,ch^° arge Q makes an 60^° with vertical of lenght l is in equilibrium in presemce of electric repulsionby Q(fixd at emean position.what is Q

Discussion

3.	1. Speed can be calculated of only uniform motion? What is the difference between speed and average speed?2. If we change the units of speed claculated we will get a different value in the case of uniform speed?
Answer» 1. Speed can be calculated of only uniform motion? What is the difference between speed and average speed? 2. If we change the units of speed claculated we will get a different value in the case of uniform speed?

Discussion

4.	A body is projected vertically upwards from the surface of a planet of radius R with a velocity equal to half the escape velocity for that planet. The maximum height attained by the body is
Answer» A body is projected vertically upwards from the surface of a planet of radius R with a velocity equal to half the escape velocity for that planet. The maximum height attained by the body is

Discussion

5.	A gas found to obey the law p2V constant. The initial temperature and volume are T0 and V0. If the gas expands to a volume 2V0, its final temperature becomes
Answer» A gas found to obey the law $p^{2} V$ constant. The initial temperature and volume are $T_{0} a n d V_{0}$ . If the gas expands to a volume $2 V_{0}$ , its final temperature becomes

Discussion

6.	The shortest wavelength of H atom in the Lyman series is λ1. The longest wavelength in the Balmer series of He+ is
Answer» The shortest wavelength of H atom in the Lyman series is $λ_{1}$ . The longest wavelength in the Balmer series of $H e^{+}$ is

Discussion

7.	32.A proton of charge +e mass m enters a uniform magnetic field B=Bi with an initial velocity v=Vxi+Vyj.Find an expression in unit vector notation for its velocity at any later time t.
Answer» 32.A proton of charge +e mass m enters a uniform magnetic field B=Bi with an initial velocity v=Vxi+Vyj.Find an expression in unit vector notation for its velocity at any later time t.

Discussion

8.	Explain briefly how the de Broglie relation Where's experimentally verified in case of electrons
Answer» Explain briefly how the de Broglie relation Where's experimentally verified in case of electrons

Discussion

9.	A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field in equilibrium state. The energy required to rotate it by 60° is W. Energy required to rotate it further by 30° will be
Answer» A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field in equilibrium state. The energy required to rotate it by 60° is W. Energy required to rotate it further by 30° will be

Discussion

10.	The value of cos 12° + cos 84° + cos 156° + cos 132° is(a) 12(b) 1(c) -12(d) -18
Answer» The value of cos 12° + cos 84° + cos 156° + cos 132° is (a) $\frac{1}{2}$ (b) 1 (c) $- \frac{1}{2}$ (d) $- \frac{1}{8}$

Discussion

11.	Let →a=^i−^j+3^k and →b=3^i−5^j+6^k. Then the magnitude of the projection of 2→a−→b on →a+→b is
Answer» Let $\to a =^i -^j + 3^k$ and $\to b = 3^i - 5^j + 6^k$ . Then the magnitude of the projection of $2 \to a - \to b$ on $\to a + \to b$ is

Discussion

12.	Determine the currentdrawn from a 12 V supply with internal resistance 0.5 Ω bythe infinite network shown in Fig. 3.32. Each resistor has 1Ω resistance.
Answer» Determine the current drawn from a 12 V supply with internal resistance 0.5 Ω by the infinite network shown in Fig. 3.32. Each resistor has 1 Ω resistance.

12.

Determine the currentdrawn from a 12 V supply with internal resistance 0.5 Ω bythe infinite network shown in Fig. 3.32. Each resistor has 1Ω resistance.

Answer»

Determine the current
drawn from a 12 V supply with internal resistance 0.5 Ω by
the infinite network shown in Fig. 3.32. Each resistor has 1
Ω resistance.

Discussion

13.	A myopic person can not see objects lying beyond 2 m. The focal length and power of the lens required to remove this defect will be
Answer» A myopic person can not see objects lying beyond $2 m$ . The focal length and power of the lens required to remove this defect will be

Discussion

14.	An object having relative density of 5 uses 1/3rd of it's weight when completely immersed in water . If there is a cavity inside the object then find fractional volume of cavity.
Answer» An object having relative density of 5 uses 1/3rd of it's weight when completely immersed in water . If there is a cavity inside the object then find fractional volume of cavity.

Discussion

15.	An electron is moving in a circular orbit of radius 10^{-4 }cm and frequency of 200 rotations per second.The agnetic field produced at the centre has magnitude
Answer» An electron is moving in a circular orbit of radius 10^{-4 }cm and frequency of 200 rotations per second.The agnetic field produced at the centre has magnitude

Discussion

16.	^n1 is the unit vector along incident ray, ^n2 along the normal to plane mirror and ^n3 is the unit vector along reflected ray direction, then which of the following must be true?
Answer» $_{1}$ is the unit vector along incident ray, $_{2}$ along the normal to plane mirror and $_{3}$ is the unit vector along reflected ray direction, then which of the following must be true?

Discussion

17.	Si unit of universal gravitational constant
Answer» Si unit of universal gravitational constant

Discussion

18.	{ A body of mass }2kg is acted upon by two forces }}{2N and }5N in the direction of }^ i+^ j and }^ j-^ k} respectively. If the body is displaced from }{(3,-2,1) to }(-1,2,3) (Positions are in }m), then }} work done is
Answer» { A body of mass }2kg is acted upon by two forces }}{2N and }5N in the direction of }^ i+^ j and }^ j-^ k} respectively. If the body is displaced from }{(3,-2,1) to }(-1,2,3) (Positions are in }m), then }} work done is

Discussion

19.	A current 'I' is flowing through wire PQR. This wire is bent in form of an angle such that part PQ is along X axiswith current directed from P to Q and placed in uniform magnetic field 'B' which is directed along y direction .If PQ= l and \angle PQR = 60^° . The ratio of magnetic forces on PQ to QR ?
Answer» A current 'I' is flowing through wire PQR. This wire is bent in form of an angle such that part PQ is along X axiswith current directed from P to Q and placed in uniform magnetic field 'B' which is directed along y direction .If PQ= l and \angle PQR = 60^° . The ratio of magnetic forces on PQ to QR ?

Discussion

20.	Two waves get superposed on a string y1 = 3 sin2 (x – 10t) and y2 = 3 sin2 (x + 10t). Then find the distance between two adjacent nodes on the string.
Answer» Two waves get superposed on a string y1 = 3 sin2 (x – 10t) and y2 = 3 sin2 (x + 10t). Then find the distance between two adjacent nodes on the string.

Discussion

21.	A dipole with dipole moment P is aligned with uniform external electric field E .The work done by an external agent to rotate the dipole by 180^() so that finally dipole moment is opposite to the electric field E is
Answer» A dipole with dipole moment P is aligned with uniform external electric field E .The work done by an external agent to rotate the dipole by 180^() so that finally dipole moment is opposite to the electric field E is

Discussion

22.	When an object is at distances x and y from a lens, a real image and a virtual image is formed respectively having same magnification. The focal length of the lens is
Answer» When an object is at distances x and y from a lens, a real image and a virtual image is formed respectively having same magnification. The focal length of the lens is

Discussion

23.	A projectiie is fired horizontally from a height of19.62 cm from the ground and reaches the groundat a horizontal distance of 49 m. The initial velocityis approximately(1) 20.1 m/s(2) 24.52 m/s(3) 28.32 m/s(4) 30.49 m/sleuation
Answer» A projectiie is fired horizontally from a height of19.62 cm from the ground and reaches the groundat a horizontal distance of 49 m. The initial velocityis approximately(1) 20.1 m/s(2) 24.52 m/s(3) 28.32 m/s(4) 30.49 m/sleuation

Discussion

24.	A particle moving with initial velocity 3i+2j m/s has acceleration as (-5i-3j)m/s2.Then path of particle is 1)circle 2)ellipse 3)straight line 4)parabola
Answer» A particle moving with initial velocity 3i+2j m/s has acceleration as (-5i-3j)m/s2.Then path of particle is 1)circle 2)ellipse 3)straight line 4)parabola

Discussion

25.	A position dependent force F=ysquare x icap +xsquare y jcap acts on a particle and displace it from x = 1 m, y = 2 m to x = 2 m, y = 1 m. The work done by the force isOptions: J10 J20 JShould have chosen Zero
Answer» A position dependent force F=ysquare x icap +xsquare y jcap acts on a particle and displace it from x = 1 m, y = 2 m to x = 2 m, y = 1 m. The work done by the force is Options: J 10 J 20 J Should have chosen Zero

Discussion

26.	106.Find the binding energy of a satellite of mass m in an orbit of radius r .( Take R = radius of earth , g= acceleration due to gravity ).
Answer» 106.Find the binding energy of a satellite of mass m in an orbit of radius r .( Take R = radius of earth , g= acceleration due to gravity ).

Discussion

27.	The amplitude of a wave disturbance propagating in the positive x-direction is given by y=11+x2 at t = 0 and y=1[1+(x−1)2] at t = 2s. the wave speed is
Answer» The amplitude of a wave disturbance propagating in the positive x-direction is given by $y = \frac{1}{1 + x^{2}}$ at t = 0 and $y = \frac{1}{[1 + (x - 1)^{2}]}$ at t = 2s. the wave speed is

Discussion

28.	An 8kg metal block of dimension 16cm×8cm×6cm is lying on a table with its face of largest area touching the table. If g=10ms−2, the minimum amount of work done (in Joules, upto two decimals ) in making it stand with maximum length vertical is
Answer» An $8 kg$ metal block of dimension $16 cm \times 8 cm \times 6 cm$ is lying on a table with its face of largest area touching the table. If $g = 10 {ms}^{- 2},$ the minimum amount of work done (in Joules, upto two decimals ) in making it stand with maximum length vertical is

Discussion

29.	Asample of paramagnetic salt contains 2.0 ×1024atomic dipoles each of dipole moment 1.5 × 10−23J T−1.The sample is placed under a homogeneous magnetic field of 0.64 T,and cooled to a temperature of 4.2 K. The degree of magneticsaturation achieved is equal to 15%. What is the total dipole momentof the sample for a magnetic field of 0.98 T and a temperature of 2.8K? (Assume Curie’s law)
Answer» A sample of paramagnetic salt contains 2.0 × 10²⁴ atomic dipoles each of dipole moment 1.5 × 10⁻²³J T⁻¹. The sample is placed under a homogeneous magnetic field of 0.64 T, and cooled to a temperature of 4.2 K. The degree of magnetic saturation achieved is equal to 15%. What is the total dipole moment of the sample for a magnetic field of 0.98 T and a temperature of 2.8 K? (Assume Curie’s law)

Discussion

30.	An interference is observed due to two coherent sources S1 placed at origin and S2 placed at (0, 3λ, 0). Here, λ is the wavelength of the sources. A detector D is moved along the positive x−axis. Find x− coordinates on the x−axis (excluding x=0 and x=∞) where maximum intensity is observed.
Answer» An interference is observed due to two coherent sources $S_{1}$ placed at origin and $S_{2}$ placed at $(0, 3 λ, 0)$ . Here, $λ$ is the wavelength of the sources. A detector D is moved along the positive $x -$ axis. Find $x -$ coordinates on the $x -$ axis $(excluding x = 0 and x = \infty)$ where maximum intensity is observed.

Discussion

31.	28.A source pf sound emits 200pi watt power which is uniformly distributed over the surface of radius 10m. What is the loudness of sound on the surface of the sphere.
Answer» 28.A source pf sound emits 200pi watt power which is uniformly distributed over the surface of radius 10m. What is the loudness of sound on the surface of the sphere.

Discussion

32.	Five charges each of magnitude q are placed at thecorners of a regular pentagon of side a as shownin figure. The electric field at the centre of thepentagon is
Answer» Five charges each of magnitude q are placed at thecorners of a regular pentagon of side a as shownin figure. The electric field at the centre of thepentagon is

Discussion

33.	what is moving coil galvanometer?
Answer» what is moving coil galvanometer?

Discussion

34.	A ball of mass 0.1 kg, initially at rest, dropped from height of 1m. Ball hits the ground and bounces off the ground. Upon impact with the ground, the velocity reduces by 20%. The height (in m) to which the ball will rise is
Answer» A ball of mass 0.1 kg, initially at rest, dropped from height of 1m. Ball hits the ground and bounces off the ground. Upon impact with the ground, the velocity reduces by 20%. The height (in m) to which the ball will rise is

Discussion

35.	Avinash practicing in a swimming pool takes enough air from his tank to fully expand his lungs before abandoning the tank at depth 'L' and swimming to the surface and failing to exhale during his ascent. At the surface ∆P between the external pressure on him and the air pressure in his lungs is 9.3 kpa. From what depth does he start?
Answer» Avinash practicing in a swimming pool takes enough air from his tank to fully expand his lungs before abandoning the tank at depth 'L' and swimming to the surface and failing to exhale during his ascent. At the surface ∆P between the external pressure on him and the air pressure in his lungs is 9.3 kpa. From what depth does he start?

Discussion

36.	A sinusoidal voltage of peak value 200 V is connected to a diode and resistor R in the circuit shown so that half-wave rectification occurs. If the forward resistance of the diode is negligible compared to R, the rms value of voltage across R in volts is approximately -
Answer» A sinusoidal voltage of peak value $200 V$ is connected to a diode and resistor $R$ in the circuit shown so that half-wave rectification occurs. If the forward resistance of the diode is negligible compared to $R$ , the rms value of voltage across $R$ in volts is approximately -

Discussion

37.	How is the concept of eddy currents and eelctrogmagnetic damping used in speedometers, electric brakes and dead beat galvanometer?
Answer» How is the concept of eddy currents and eelctrogmagnetic damping used in speedometers, electric brakes and dead beat galvanometer?

Discussion

38.	In the previous question find the ratio of the currents through the cell at t=0 and t=∞
Answer» In the previous question find the ratio of the currents through the cell at t=0 and t= $\infty$

Discussion

39.	77 ideal gas equation
Answer» 77 ideal gas equation

Discussion

40.	Acceleration due to gravity on moon is 16 of the acceleration due to gravity on earth. If the ratio of densities of earth (ρm) and moon (ρe) is (ρeρm)=53 then radius of moon Rm in terms of Re will be
Answer» Acceleration due to gravity on moon is $\frac{1}{6}$ of the acceleration due to gravity on earth. If the ratio of densities of earth $(ρ_{m})$ and moon $(ρ_{e})$ is $(\frac{ρ_{e}}{ρ_{m}}) = \frac{5}{3}$ then radius of moon $R_{m}$ in terms of $R_{e}$ will be

Discussion

41.	Points A and B are situated along the extended axis of 2 cm long bar magnet at a distance x and 2x cm respectively. From the pole nearer to the points, the ratio of the magnetic field at A and B will be
Answer» Points A and B are situated along the extended axis of 2 cm long bar magnet at a distance x and 2x cm respectively. From the pole nearer to the points, the ratio of the magnetic field at A and B will be

Discussion

42.	A particle moves along a straight line with a constant acceleration a= +0.5m/s'2.at t=0 it is at x=0 and it's velocity is v=0.plot the velocity time graph and position time graphs for the period t=0 to t= 5 s
Answer» A particle moves along a straight line with a constant acceleration a= +0.5m/s'2.at t=0 it is at x=0 and it's velocity is v=0.plot the velocity time graph and position time graphs for the period t=0 to t= 5 s

Discussion

43.	19. A solid sphere rolls down an inclined plane of inclination 60^° ,the acceleration of the center of mass of the sphere is(Assume pure rolling)? 1.53/14g 2.g/3 3.g/2 4.5g/14
Answer» 19. A solid sphere rolls down an inclined plane of inclination 60^° ,the acceleration of the center of mass of the sphere is(Assume pure rolling)? 1.53/14g 2.g/3 3.g/2 4.5g/14

Discussion

44.	If the spinning speed of the earth is decreased, then the weight of the body at the equator
Answer» If the spinning speed of the earth is decreased, then the weight of the body at the equator

Discussion

45.	Read each statement below carefully and state with reasons, if it is true or false : (a) The magnitude of a vector is always a scalar, (b) each component of a vector is always a scalar, (c) the total path length is always equal to the magnitude of the displacement vector of a particle. (d) the average speed of a particle (defined as total path length divided by the time taken to cover the path) is either greater or equal to the magnitude of average velocity of the particle over the same interval of time, (e) Three vectors not lying in a plane can never add up to give a null vector.
Answer» Read each statement below carefully and state with reasons, if it is true or false : (a) The magnitude of a vector is always a scalar, (b) each component of a vector is always a scalar, (c) the total path length is always equal to the magnitude of the displacement vector of a particle. (d) the average speed of a particle (defined as total path length divided by the time taken to cover the path) is either greater or equal to the magnitude of average velocity of the particle over the same interval of time, (e) Three vectors not lying in a plane can never add up to give a null vector.

Discussion

46.	A hollow cylindrical wire carries a current I, having inner and outer radii 'R' and 2R respectively. Magnetic field at a point which 3R/2 distance away from its axis is
Answer» A hollow cylindrical wire carries a current I, having inner and outer radii 'R' and 2R respectively. Magnetic field at a point which 3R/2 distance away from its axis is

Discussion

47.	The velocities of a body moving along a straight line with a constant acceleration are 10m/s at t=4s and 20m/s at t=9s. The velocity of athe body at t=1s is
Answer» The velocities of a body moving along a straight line with a constant acceleration are 10m/s at t=4s and 20m/s at t=9s. The velocity of athe body at t=1s is

Discussion

48.	A charged particle is moving in a uniform electric field which quantity does not change
Answer» A charged particle is moving in a uniform electric field which quantity does not change

Discussion

49.	The wavelength of light from the spectral emission line of sodium is 589 nm. Find the kinetic energy at which (a) an electron, and (b) a neutron, would have the same de Broglie wavelength.
Answer» The wavelength of light from the spectral emission line of sodium is 589 nm. Find the kinetic energy at which (a) an electron, and (b) a neutron, would have the same de Broglie wavelength.

Discussion

50.	A coin placed on a rotating turn table just slips if it is placed at a distance of 20 cm from the centre. If the angular velocity of the turn table is doubled, the coin will just slip at a distance of
Answer» A coin placed on a rotating turn table just slips if it is placed at a distance of 20 cm from the centre. If the angular velocity of the turn table is doubled, the coin will just slip at a distance of

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

The capacity of a discrete lossless channel, with 3 input symbols and 5 output symbols, is ______bits/symbol.1.585

a charged metallic bob of mass m,ch^° arge Q makes an 60^° with vertical of lenght l is in equilibrium in presemce of electric repulsionby Q(fixd at emean position.what is Q

1. Speed can be calculated of only uniform motion? What is the difference between speed and average speed?2. If we change the units of speed claculated we will get a different value in the case of uniform speed?

A body is projected vertically upwards from the surface of a planet of radius R with a velocity equal to half the escape velocity for that planet. The maximum height attained by the body is

A gas found to obey the law p2V constant. The initial temperature and volume are T0 and V0. If the gas expands to a volume 2V0, its final temperature becomes

The shortest wavelength of H atom in the Lyman series is λ1. The longest wavelength in the Balmer series of He+ is

32.A proton of charge +e mass m enters a uniform magnetic field B=Bi with an initial velocity v=Vxi+Vyj.Find an expression in unit vector notation for its velocity at any later time t.

Explain briefly how the de Broglie relation Where's experimentally verified in case of electrons

A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field in equilibrium state. The energy required to rotate it by 60° is W. Energy required to rotate it further by 30° will be

The value of cos 12° + cos 84° + cos 156° + cos 132° is(a) 12(b) 1(c) -12(d) -18

Let →a=^i−^j+3^k and →b=3^i−5^j+6^k. Then the magnitude of the projection of 2→a−→b on →a+→b is

Determine the currentdrawn from a 12 V supply with internal resistance 0.5 Ω bythe infinite network shown in Fig. 3.32. Each resistor has 1Ω resistance.

A myopic person can not see objects lying beyond 2 m. The focal length and power of the lens required to remove this defect will be

An object having relative density of 5 uses 1/3rd of it's weight when completely immersed in water . If there is a cavity inside the object then find fractional volume of cavity.

An electron is moving in a circular orbit of radius 10^{-4 }cm and frequency of 200 rotations per second.The agnetic field produced at the centre has magnitude

^n1 is the unit vector along incident ray, ^n2 along the normal to plane mirror and ^n3 is the unit vector along reflected ray direction, then which of the following must be true?

Si unit of universal gravitational constant

{ A body of mass }2kg is acted upon by two forces }}{2N and }5N in the direction of }^ i+^ j and }^ j-^ k} respectively. If the body is displaced from }{(3,-2,1) to }(-1,2,3) (Positions are in }m), then }} work done is

Two waves get superposed on a string y1 = 3 sin2 (x – 10t) and y2 = 3 sin2 (x + 10t). Then find the distance between two adjacent nodes on the string.

A dipole with dipole moment P is aligned with uniform external electric field E .The work done by an external agent to rotate the dipole by 180^() so that finally dipole moment is opposite to the electric field E is

When an object is at distances x and y from a lens, a real image and a virtual image is formed respectively having same magnification. The focal length of the lens is

A projectiie is fired horizontally from a height of19.62 cm from the ground and reaches the groundat a horizontal distance of 49 m. The initial velocityis approximately(1) 20.1 m/s(2) 24.52 m/s(3) 28.32 m/s(4) 30.49 m/sleuation

A particle moving with initial velocity 3i+2j m/s has acceleration as (-5i-3j)m/s2.Then path of particle is 1)circle 2)ellipse 3)straight line 4)parabola

A position dependent force F=ysquare x icap +xsquare y jcap acts on a particle and displace it from x = 1 m, y = 2 m to x = 2 m, y = 1 m. The work done by the force isOptions: J10 J20 JShould have chosen Zero

106.Find the binding energy of a satellite of mass m in an orbit of radius r .( Take R = radius of earth , g= acceleration due to gravity ).

The amplitude of a wave disturbance propagating in the positive x-direction is given by y=11+x2 at t = 0 and y=1[1+(x−1)2] at t = 2s. the wave speed is

An 8kg metal block of dimension 16cm×8cm×6cm is lying on a table with its face of largest area touching the table. If g=10ms−2, the minimum amount of work done (in Joules, upto two decimals ) in making it stand with maximum length vertical is

28.A source pf sound emits 200pi watt power which is uniformly distributed over the surface of radius 10m. What is the loudness of sound on the surface of the sphere.

Five charges each of magnitude q are placed at thecorners of a regular pentagon of side a as shownin figure. The electric field at the centre of thepentagon is

what is moving coil galvanometer?

A ball of mass 0.1 kg, initially at rest, dropped from height of 1m. Ball hits the ground and bounces off the ground. Upon impact with the ground, the velocity reduces by 20%. The height (in m) to which the ball will rise is

A sinusoidal voltage of peak value 200 V is connected to a diode and resistor R in the circuit shown so that half-wave rectification occurs. If the forward resistance of the diode is negligible compared to R, the rms value of voltage across R in volts is approximately -

How is the concept of eddy currents and eelctrogmagnetic damping used in speedometers, electric brakes and dead beat galvanometer?

In the previous question find the ratio of the currents through the cell at t=0 and t=∞

77 ideal gas equation

Acceleration due to gravity on moon is 16 of the acceleration due to gravity on earth. If the ratio of densities of earth (ρm) and moon (ρe) is (ρeρm)=53 then radius of moon Rm in terms of Re will be

Points A and B are situated along the extended axis of 2 cm long bar magnet at a distance x and 2x cm respectively. From the pole nearer to the points, the ratio of the magnetic field at A and B will be

A particle moves along a straight line with a constant acceleration a= +0.5m/s'2.at t=0 it is at x=0 and it's velocity is v=0.plot the velocity time graph and position time graphs for the period t=0 to t= 5 s

19. A solid sphere rolls down an inclined plane of inclination 60^° ,the acceleration of the center of mass of the sphere is(Assume pure rolling)? 1.53/14g 2.g/3 3.g/2 4.5g/14

If the spinning speed of the earth is decreased, then the weight of the body at the equator

A hollow cylindrical wire carries a current I, having inner and outer radii 'R' and 2R respectively. Magnetic field at a point which 3R/2 distance away from its axis is

The velocities of a body moving along a straight line with a constant acceleration are 10m/s at t=4s and 20m/s at t=9s. The velocity of athe body at t=1s is

A charged particle is moving in a uniform electric field which quantity does not change

The wavelength of light from the spectral emission line of sodium is 589 nm. Find the kinetic energy at which (a) an electron, and (b) a neutron, would have the same de Broglie wavelength.

A coin placed on a rotating turn table just slips if it is placed at a distance of 20 cm from the centre. If the angular velocity of the turn table is doubled, the coin will just slip at a distance of