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Question -

A SONAR system fixed in a submarine operates at a frequency 40.0 kHz. An enemy submarine moves towards the SONAR with a speed of 360 km h–1. What is the frequency of sound reflected by the submarine? Take the speed of sound in water to be 1450 m s–1.



Answer -

Operating frequency of the SONAR system, ν = 40 kHz

Speed of the enemy submarine, ve =360 km/h = 100 m/s

Speed of sound in water, v =1450 m/s

The source is at rest and the observer (enemy submarine)is moving toward it. Hence, the apparent frequency () received and reflected by thesubmarine is given by the relation:

The frequency () received by the enemy submarineis given by the relation:

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