Two tuning forks $P$ and $Q$ are vibrated together. The numbers of beats produced are represented by the…

Two tuning forks $P$ and $Q$ are vibrated together. The numbers 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 341 Hz, the frequency of $Q$ will be Graph showing Beats vs t(s) with lines OA and OB, with points (1,3) for line OA and (1,2) for line OB
  1. 341 Hz
  2. 338 Hz
  3. 344 Hz
  4. None of these

Solution

$n_Q = 341 \pm 3 = 344\text{ Hz}$ or $338\text{ Hz}$ On waxing $Q$, the number of beats decreases, hence $n_Q = 344\text{ Hz}$.

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