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Question

A tuning fork produces 4 beats per second with another tuning fork of frequency 256 Hz. The first one is now loaded with a little wax and number of beats heard are 6 per second. The original frequency of the tuning fork is

A
252 Hz
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B
260 Hz
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C
250 Hz
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D
262 Hz
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Solution

The correct option is A 252 Hz
f=256±4Hz.
On loading the first one the number of beats increase. Therefore, the frequency of the tuning fork must be 252 Hz. As it will decrease further on loading and number of beats/s increase.

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