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qUESTIONS

A car moving at constant velocity sounds its horn (frequency n) as it passes by a pedestrian waiting to cross the road. Which of the following graphs correctly represents the frequency of the horn apparent to the pedestrian with respect to time t ?

A listener approaches a stationary source of sound at 20% of the speed of sound in air. The percentage increase in the apparent frequency is

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

On a windless day, when the speed of sound in air is v, a stationary highway police detects a drop of 12.5% in the pitch of the horn of a car. The car is

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

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

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