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qUESTIONS

A rocket is moving at a speed of220 m/s towards a stationary target. It emits a wave of frequency 1200 Hz. Some of the sound reaching the target gets reflected back to the rocket as an echo. Calculate (1) The frequency of sound detected by the target and (2) The frequency of echo detected by rocket (velocity of sound= 330 m/s.)

A man shouts loudly close to ahigh wall. He hears an echo. If the man is at40 m from the wall, how long after the shout will the echo be heard ? (speed of sound in air=330 m/s)

Consider a closed box of rigid walls so that the density of the air inside it1s constant. On heating, the pressure of this enclosed air is increased from P₀ to P. It is now observed that sound travels 1.5 times faster than at pressure P₀ calculate P/P₀.

Suppose you are listening to anout-door live concert sitting at a distance of 150m from the speakers. Your friend is listeningto the live broadcast of the concert in anothercountry and the radio signal has to travel 3000km to reach him. Who will hear the music firstand what will be the time difference betweenthe two? Velocity of light =3×10⁸ m/s and thatof sound 1s 330m/s.

The speed of sound in air is 330m/s and that in glass is 4500 m/s. What is theratio of the wavelength of sound of a givenfrequency in the two media?

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