When two tuning forks $A$ and $B$ are sounded together, 4 beats per second are heard. The frequency of the fork $B$ is $384 \mathrm{~Hz}$. When one of the prongs of the fork $A$ is filled and sounded with $B$, the beat frequency increases, then the frequency of the fork $A$ is

JEE PHYSICS MCQ: WAVES

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Analyzing +4 | -1

When two tuning forks

A

and

B

are sounded together, 4 beats per second are heard. The frequency of the fork

B

384 \mathrm{~Hz}

. When one of the prongs of the fork

A

is filled and sounded with

B

, the beat frequency increases, then the frequency of the fork

A

View answer and explanation

Correct option: D

388 \mathrm{~Hz}

Option D (

388 \mathrm{~Hz}

) is correct because filling the prong increases the frequency of A, and since the beat frequency increased, the original frequency of A must have been higher than B.

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