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qUESTIONS

The pitch of the whistle of an engine appears to drop to 5/6 th of its original value when it passes a stationary observer. If the speed of sound in air is 350 m/s, the speed of the engine is

Suppose the ratio of densities of nitrogen and oxygen is 14: 16. The temperature at which the speed of sound in nitrogen be same as that in oxygen at 55 °C is

The temperature at which the speed of sound in air becomes three times of its value at 0 °C is

A man watching two trains, one leaving and another coming in with equal speeds of 4 m/s. If they sound their whistles each of frequency 240 Hz, the number of beats heard by the man will be (Take velocity of sound as 320 m/s

A source of sound emitting waves of wavelength 60 cm recedes from a stationary listener at 1/5 th the speed of sound. To the listener , the apparent wavelength is

A transverse wave of the form y = 0.05 sin [( π/2(4t-x )](in SI units) moves along a rope. At x = 0, t = 0, the point of the rope is moving

The apparent frequency of the horn sounded by a train changes in the ratio 5: 4 as the train speeds past a stationary person. If the speed of sound in air is 360 m/s, the speed of the train is

A progressive wave of frequency 50 Hz is travelling with velocity 350 m/s through a medium. The change in phase at a given time interval of 0.01 s is

An observer standing near the seashore observes 54 waves per minute. If the wavelength of the water wave is 10 m then the velocity of water wave is.

The wavelength of a wave in a medium is 0.5 m. The phase difference between the oscillations at two points in the medium due to this wave is π/5 What is the minimum distance between these points?

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