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in Physics by (49.4k points)

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 be1450ms-1.

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Given:

f = 40 kHz v = 1450ms-1

Speed of enemy submarine = v0 = 360 km/ hr

=360 ×5/16 =100 m/s

Apparent frequency of sound waves:

(source at rest and observer moving towards the source)

Now this frequency is reflected by the enemy submarine and is observed by the SONAR

Note: Here the observer (SONAR) is at rest and the source is moving towards the observer at a speed of 360 km h-1 = 100 ms-1(vs)

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