NEET UG PHYSICS MCQ: WAVES

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A SONAR system fixed in a submarine operates at a frequency

40.0 \mathrm{kHz}

. An enemy submarine moves towards the SONAR with a speed of

360 \mathrm{~km} / \mathrm{h}

. What is the frequency of sound reflected by a submarine? Take the speed of sound in water to be

1450 \mathrm{~m} / \mathrm{s}

.

View answer and explanation

Correct option: A

45.93 \times {10^3}\,\,

Option A (

45.93 \times {10^3}\,\,

) is correct because it is the frequency calculated using the Doppler effect formula for both the submarine approaching and reflecting the sound.

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