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25 tuning forks are arranged in series i...

25 tuning 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

A

72 Hz

B

288 Hz

C

84 Hz

D

87 Hz

Text Solution

Verified by Experts

The correct Answer is:
C
`2n-(24xx3)=nimpliesn=72Hz`
Hence, frequency of 21st tuning fork
`=2xx72-20xx3=84Hz`
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