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56 tuning forks are so arranged in serie...

56 tuning forks are so arranged in series that each fork gives 4 beats per second with the previous one.The frequency of the last fork is three times that of the first.The frequency of the fork is

A

55 Hz

B

110 Hz

C

75 Hz

D

220 Hz

Text Solution

Verified by Experts

The correct Answer is:
B
`a_(n)= a + (N - 1)d`
`3n = n + (56 - 1) xx 4`
`2n = 55 xx 4 " " :. n = 110 Hz`
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