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A listener is at rest and a police siren...

A listener is at rest and a police siren is moving away from the listerner at 60m/s. what frequency does the listerner hear given that the velocity of sound in air is 340m/s and frequency os siren is 500Hz?

Text Solution

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Observed frequency
`v'=((V)/(V+V_(s)))v`
`=((340)/(340+60))500`
`=(340)/(400)xx500=(1700)/(4)=425Hz`
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