JEE Main & Advanced
Physics
Wave Mechanics
Question Bank
Critical Thinking
question_answer
16 tunning 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 [CBSE PMT 2000; MP PET 2001]
A) 120
B) 160
C) 180
D) 220
Correct Answer:
A
Solution :
Using nLast = nFirst + (N ? 1)x Þ 2n = n + (16 ? 1) ´ 8 Þ n = 120 Hz