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 ... $ Hz$
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(c)${n_Q} = 341 \pm 3 = 344Hz$ or $338Hz$
on waxing $Q,$ the number of beats decreases hence ${n_Q} = 344Hz$
on waxing $Q,$ the number of beats decreases hence ${n_Q} = 344Hz$
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