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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 `15ms^-1`. Then the frequency of sound that the observer hears in the echo reflected from the cliff is (Take velocity of sound in air `=330ms^-1`)

A

`885 Hz`

B

`765 Hz`

C

`800 Hz`

D

`838 Hz`

Text Solution

Verified by Experts

frequency received at cliff
`f' = f ((v)/(v - v_(s))) = (800) ((330)/(330 - 15))`
As there is no relative motion between the cliff and observer, frequency of echo = `838 Hz`
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