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Beat Frequency

Two tuning fo...

Question

Two tuning forks A and B produce 6 beats/sec when sounded together. When B is slightly loaded with wax, the beats are reduced to 4beats/sec. If the frequency of A is 512Hz, the frequency of B is

A

506 Hz

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B

516 Hz

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C

508 Hz

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D

518 Hz

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Solution

The correct option is B 518 Hz
When loaded with wax, frequency of beats is reduced.
$\Rightarrow$ Frequency of $B$ is higher than that of $A$ .
$\Rightarrow f_{B} - f_{A} = 6$
$\Rightarrow f_{B} = (512 + 6) = 518 H z$

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