Q. Two tuning fork, A and B produce notes of frequencies 258 Hz and 262 Hz. An unknown note sounded with a produces certain beats. When the same note is sounded with B, the beat frequency gets doubled, the unknown frequency is

A) 256 Hz
B) 254 Hz
C) 300 Hz
D) 280 Hz
Explanation

(b) $n_{A} = 258\ Hz$
$n_{B} = 262\ Hz$
Let n is the frequency of unknown tuning fork. It produces x beats with 258 and 2x with 262
262-(258-x)=2x
262-268+x=2x
X=4
N=254Hz

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

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