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A speed ign motorcyclist sees traffic ha...

A speed ign motorcyclist sees traffic ham ahead of him. He slows doen to `36 km//h` He finds that traffic has eased and a car moving ahead of him at `18 km//h` is honking at a frequency of 1392 Hz. If the speed of sound is `343m//s`, the frequency of the honk as heard by him will be

A

`1332Hz`

B

`1372Hz`

C

`1412Hz`

D

`1454Hz`

Text Solution

Verified by Experts

The correct Answer is:
C
As listenerg is behind the source of source of sound hence
`upsilon_(L)=-36km//h=-10m//s`
and`upsilon_(s)=-18km//h=-5m//s`
`v=1392Hz, upsilon=343m//s`
`=(353)/(348)xx1352~~1412Hz`
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