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A tuning fork of known frequency 256 Hz ...

A tuning fork of known frequency 256 Hz makes 5 beats per second with the vibreting string of a piano.The beat frequency decreases to 2 beats per second when the tension in the piano string is slightly increased.The frequency of the piano string before increasing the tension was

A

256+5Hz

B

256+2Hz

C

256-2Hz

D

256-5Hz

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The correct Answer is:
A
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TARGET PUBLICATION-WAVE MOTION -MCQ 7.1
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