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 [Kerala (Engg.) 2001]

Apparent frequency will be equal to real frequency

25 tunning forks are arranged in series in the order of decreasing fre

1.	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 [Kerala (Engg.) 2001]
A.	72 Hz
B.	288 Hz
C.	Apparent frequency will be equal to real frequency
D.	87 Hz
Answer» D. 87 Hz

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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 [Kerala (Engg.) 2001]

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