Q. 16 tuning forks are arranged in the order of increasing frequencies. Any two successive forks give 8 beats per sec when sounded together. If the frequency of the last fork is twice the first, then the frequency of the first fork is
A) 120
B) 160
C) 180
D) 220
Explanation
(a) Using $n_{Last} - n_{First} + (N - 1)x$
$\Rightarrow 2n = n + (16 - 1) \times 8 \Rightarrow n = 120\ Hz$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.