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A car moving at a velocity of 17 ms^(-1)...

A car moving at a velocity of 17 `ms^(-1)` towards an approaching bus that blows a horn at a frequency of 640 Hz on a straight track. The frequency of this horn appears to be 680 Hz to the car driver. If the velocity of sound in air is 340 `ms^(-1)` , then the velocity of the approaching bus is

A

`2ms^(-1)`

B

`4 ms^(-1)`

C

`8 ms^(-1)`

D

`10 ms^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
Using, `v. = v ((v+v_(0))/(v-v_(0)))`
Here, `v. = 600 Hz, v= 640 Hz`
`v = 340 ms^(-1)` and `v_(0) = 17 ms^(-1)`
`v_(s) = 4ms^(-1)`
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