A wall is moving with velocity u and a source of sound moves with velocity `(u)/(2)` in the same direction as shown in the figure. Assuming that the sound travels with velocity `10u`, the ratio of incident sound wavelength on the wall to the reflected sound wavelength by the wall is equal to

Sound moves with higher velocity if

A wall is moving with constant velocity u towards a fixed source of sound of frequency f . The velocity of sound is v . The wavelength of the sound reflected by the wall is

The observer is moving with velocity 'v'_(0) towards the stationary source of sound and then after crossing moves away from the source with velocity 'v'_(0) . Assume that the medium through which the sound waves travel is at rest. If v is the velocity of sound and n is the frequency emitted by the source, then the difference between appearent frequencies heard by the observer is

A ball of mass 'm' moves normal to a wall with a velocity 'u' and rebounde with the same speed. The change in momentum of the ball during the rebounding is

If a ball strickes with a velocity u_(1) at the wall which itself is approaching it with a velocity u_(2) then find the velocity of the ball after collision with the wall.