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Beat Frequency

A set of 24 t...

Question

A set of 24 tuning forks are so arranged that each gives 6 beats per second with the previous one. If the frequency of the last tuning fork is double that of the first, frequency of the second turning fork is:

A

138 Hz

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B

144 Hz

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C

132 Hz

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D

276 Hz

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Solution

The correct option is B 144 Hz

According to quest- $f_{1} + 23 (6) = 2 f_{1}$
$23 (6) = f_{1}$
$f_{1} = 138$
$f_{2} = f_{1} + 6$
$f_{2} = 138 + 6 = 144 H z$

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