Physics-
General
Easy
Question
25 tunning forks are arranged in series in the order of decreasing frequency. Any two successive forks produce 3 beats/sec. If the frequency of the first turning fork is the octave of the last fork, then the frequency of the 21st fork is
- 72 Hz
- 288 Hz
- 84 Hz
- 87 Hz
The correct answer is: 84 Hz
According to the question frequencies of first and last tuning forks are 2n and n respectively.
Hence frequency in given arrangement are as follows
Þ 2n – 24 ´ 3 = n Þ n= 72 Hz
So, frequency of 21st tuning fork
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