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A sonar system fixed in a submariene ope...

A sonar system fixed in a submariene operatres at a frequency 40KHz. An enemey submarine moves towards the sonar with a speed of `360kmh^(-1)`. What is the frequency of sound reflected by the submarine? Speed of sound in water `1450ms^(-1)?`

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Verified by Experts

The correct Answer is:
`45.93 kHz`
Frequency received by subnarine
`f_(1)=f_(1) =f_(0)((v)/(v-v_(s)))`
`f_(2)=f_(1)((v+v_(s))/(v))=f_(0)((v+v_(s))/(v-v_(s)))=140((1450+100)/(1450+100))`
`=45.93kHz`
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ALLEN-WAVES AND OSCILLATIONS-Part-1(Exercise-04)[A]
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  13. A person going away from a factory on his scooter at a speed of 36 km/...

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  14. A car has two horns having a difference in frequency of 180 Hz. The ca...

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  15. A whistle emitting a sound of frequency 440 Hz is tied to a string of ...

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  16. Two tuning forks with natural frequencies 340 Hz each move relative to...

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  17. A sonar system fixed in a submariene operatres at a frequency 40KHz. A...

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  18. A sonometer wire under tension of 64 N vibrating in its fundamental mo...

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  19. A train approaching a hill at a speed of 40 km/hr sounds a whistle of ...

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