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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

765 Hz

B

800 Hz

C

838 Hz

D

885 Hz

Text Solution

Verified by Experts

The correct Answer is:
C
`f.=f((v)/(v-v_(s)))`
`=800((330)/(330-15))=(800xx330)/(315)impliesf.=838Hz`.
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