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A car is moving with 90 km h^(-1) blows ...

A car is moving with `90 km h^(-1)` blows a horn of 150 Hz, towards a cliff. The frequency of the reflected sound heard by the driver will be (speed of sound in air is `340 ms^(-1)` )

A

`2ms^(-1)`

B

`4ms^(-1)`

C

`8ms^(-1)`

D

`10ms^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
`f.=f((v+v_(o))/(v-v_(S)))implies680=640((340+17)/(340-v_(s)))`
`implies (68)/(64)=(357)/(340-v_(s))`
`impliesv_(s)=4m//s`.
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