First slide

Beats

Question

Two tuning forks P and Q are vibrated together. The number of beats produced are represented by the straight line OA in the following graph. After loading Q with wax again these are vibrated together and the beats produced are represented by the line OB. If the frequency of P is 341Hz, the frequency of Q will be

Moderate

A

341 Hz
B

338 Hz
C

344 Hz
D

None of the above

Solution

$n_{Q} = 341 \pm 3 = 344 Hz or 338 Hz$
on waxing Q, the number of beats decreases hence $n_{Q} = 344 Hz$

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