NEET Physics Waves Questions Solved

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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 

(1) 250 Hz

(2) 253 Hz

(3) 259 Hz

(4) 262 Hz

(3) It is given that

nA = Unknown frequency = ?

nB = Known frequency = 256 Hz

x = 3 bps, which remains same after loading

Unknown tuning fork A is loaded so nA

Hence nA↓ – nB = x ... (i) → Correct

nBnA↓ = x ... (ii) → Wrong

nA = nB + x = 256 + 3 = 259 Hz.

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