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

A

800 Hz

B

838 Hz

C

885 Hz

D

765 Hz

Text Solution

Verified by Experts

The correct Answer is:
B
Apparent frequency of echo
`n.=n(v/(v-v_(s)))=800(330/(330-15))`
`=(800xx330)/315=838` Hz
The option (B) is correct.
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