Two tuning forks A & B produce notes of frequencies 256 Hz & 262 Hz respectively. An unknown note sounded at the same time with A produces beats. When the same note is sounded with B, beat frequency is twice as large. The unknown frequency could be:
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(b, d)
262 – f| = |256 – f| x 2
⇒ (262 – f) = ± (256 – f) x 2
⇒ f = 250, 258 Hz
Unknown Frequency can not be greater than 262 Hz. because no. of beats heard with 262 Hz is more then the no. of beats heard with 256 Hz.
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