What change of temperature of air in pipe is necessary to bring the pipe and the unloaded fork into unison?

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An organ pipe is sounded with a tuning fork of frequency 256Hz.When the air in the pipe is at temperature of 15Â°C,23 beats are heard in 10 seconds.When the tuning fork is loaded with a small piece of wax,the beat frequency is found to decrease.What change of temperature of air in pipe is necessary to bring the pipe and the unloaded fork into unison?

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What change of temperature of air in pipe is necessary to bring the pipe and the unloaded fork into unison?

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