Q. 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
A) $341\ Hz$
B) $338\ Hz$
C) $344\ Hz$
D) None of the above
Explanation
(c) $n_{Q} = 341 \pm 3 = 344Hz$ or $338Hz$
On waxing $Q,$ the number of beats decreases hence
$n_{Q} = 344Hz$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.