When a tuning fork A of unknown frequency is sounded with another tuning fork B of frequency $$256$$ Hz, then $$3$$ beats per second are observed. After that A is loaded with wax and sounded, the again $$3$$ beats per second are observed. The frequency of the tuning fork A is

Question

Infinity Learn · Accepted Answer

It is given that nA $$=$$ Unknown frequency $$=$$ ?nB $$=$$ Known frequency $$=$$ $$256$$ Hzx $$=$$ $$3$$ bps, which remains same after loading Unknown tuning fork A is loaded so nA↓Hence nA↓ – nB  $$=$$ x        ... (i)        →       Correct            nB  – nA↓ $$=$$ x        ... (ii)       →        Wrong⇒ nA $$=$$ nB $$+$$ x $$=$$ $$256$$ $$+$$ $$3$$ $$=$$ $$259$$ Hz.

When a tuning fork A of unknown frequency is sounded with another tuning fork B of frequency 256 Hz, then 3 beats per second are observed. After that A is loaded with wax and sounded, the again 3 beats per second are observed. The frequency of the tuning fork A is

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