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A vehicle moving on a straight road soun...

A vehicle moving on a straight road sounds a whistle of frequency `256Hz` while nearing a hill with a velocity `10ms^(-1)`. The number of beats per second observed by a person travelling in the vehicle is `(V=330ms^(-1))`

A

zero

B

`10`

C

`14`

D

`16`

Text Solution

Verified by Experts

The correct Answer is:
A
`Deltan=(2nV_(s))/(V-V_(s))=(2xx255xx4)/(320)=16`
The no.of beats produced is `16` per second but no.of beats neard (observed) by observer .O. as maximum no.of beats heard is only `10` per second.
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NARAYNA-WAVES-Exercise-I (H.W)
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