An unknown tuning fork sounded together with a tuning fork of frequency 256 emits two beats. On loading tuning fork of frequency 256, the number of beats heard is 1 per second. The frequency of unknown tuning fork is
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Frequency of unknown tuning fork can be 258 Hz or 254 Hz. On loading the given tuning fork, its frequency will decrease. Say it becomes 255 Hz. With 254 Hz, beat frequency is 1 Hz which is given. Hence, frequency of unknown tuning fork is 254 Hz.
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