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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
Given,
`f_(0)=800Hz`
`V_("source")=15ms^(-1)`

`f_(a)=f_(0)((V+V_(0))/(V-V_(s)))`
`impliesf_(a)=(330)/((330-15))xx800=(330)/(315)xx800`
`f_(a)=838Hz`
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