A siren emitting a sound of frequency 80...

A siren emitting a sound of frequency 800 Hz moves away from an observer towards a cliff at a speed of `15 ms^-1` Then , the frequency of sound that the observer hears in the echo reflected from the cliff is:

`885 Hz`

`765 Hz`

`800 Hz`

`838 Hz`

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A sound of frequency 1500 Hz is emitted by a source which moves away from an observer and moves towards a cliff at a speed of 6 ms^(-1) (a) Calculate the frequency of the sound which is coming directly from the source. (b) Compute the frequency ofsound heard by the observer reflected off the cliff. Assume the speed of sound in air is 330 ms^(-1)

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