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A SONAR system fixed in a submarine oper...

A SONAR system fixed in a submarine operates at a frequency 40.0kHz. An enemy submarine moves towards the SONAR with a speed of `360km h^(-1)`. What is the frequency of sound reflected by the submarine ? Take the speed of sound in water to be `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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