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A Tuning fork M of frequency 150 Hz give...

A Tuning fork M of frequency 150 Hz given 10 beats in 2 sec with a tuning fork N. when M is lightly loaded 6 beats in 2 sec are heard. Frequency of N is

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The possible frequency` = 150 +-5 `
` = 155`Hz or 145Hz
number of beats reduced to 3 This is possible only with frequency 155Hz
Hence frequency = N = 155Hz
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