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Question

Two tuning forks when sounded together produce 6 beats/s. The first fork has the frequency 3% higher than a standard one and the second has the frequency 2% less than the standard fork. The frequencies for the forks are


A

126.3, 120.3 Hz

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B

162.7, 156.7 Hz

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C

136.2, 130.2 Hz

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D

123.6, 117.6 Hz

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Solution

The correct option is C

123.6, 117.6 Hz


(f+3f100)(f2f100)=6

5f=600 or f=120 Hz

f+3f100=123.6 Hz,

f2f100=1202×120100=117.6 Hz


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