JEE PHYSICS MCQ: WAVES

1 Hard

1 of 1

Application +4 | -1

A SONAR system fixed in a submarine operates at a frequency

40 \mathrm{~kHz}

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

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

. The frequency of sound is reflected by submarine is (Speed of sound in water

=1400 \mathrm{~m} / \mathrm{s}

)

View answer and explanation

Correct option: B

\frac{600}{13} \mathrm{kHz}

Option B (

\frac{{600}}{{13}} \mathrm{{kHz}}

) is correct because it accounts for the Doppler effect twice, once when the sound reaches the submarine and again when it's reflected back.

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T

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