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qUESTIONS

An observer moves towards a stationary source of sound, with a velocity one-fifth of the velocity of sound. What is the percentage increase in the apparent frequency?

A source of sound is moving with constant velocity of 10 m/s emitting a note of frequency 290 Hz. The ratio of frequencies observed by a stationary observer while the source is approaching him and after it crosses him is (Speed of sound in air is 330 m/s)

To a stationary listener, the frequency of the horn from a car approaching at 108 km/h appears to be 418 Hz. If the speed of sound in air is 330 m/s, the true frequency of the horn is

A radio station broadcasts signal of wavelength 100m. The speed of the radiowave is 3 x 10^8 m/s. At what frequency can this signal be tuned?

Two trains, both travelling at 252 km/h, approach each other. If one of the trains blows a whistle of frequency 900 Hz, the frequency of the sound as heard by the driver of the other train is (Speed of sound in air =350m/s

Sound waves travel with a speed of 350 m/s through warm air and with a speed of 3500 m/s through brass. The wavelength of a 700 Hz acoustic wave as it enters brass from warm air……….

A source of sound and a listener both are moving in the same direction, the source following the listener. If the velocity of sound, source and listener are v, vS and vL respectively, then the ratio of the actual frequency of the source and apparent frequency as received by the listener is

A boy is standing between two parallel cliffs and fires a gun. If he hears first and second echoes after 1.2 sec and 3.6 sec respectively, the distance between the cliffs is (Take velocity of sound = 340 m/s)

A man standing 48 m away from a wall fires a gun. Calculate the time after which an echo is heard (The speed of sound in air is 320 ms-¹)

If a stationary listener notes a change of 25 % in the frequency of a whistle of an engine coming towards him. then the velocity of the engine is (Take velocity of sound 332 m/s

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