NEET Physics Waves Questions Solved

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If two tuning forks A and B are sounded together, they produce 4 beats per second. A is then slightly loaded with wax, they produce 2 beats when sounded again. The frequency of A is 256. The frequency of B will be 

(1) 250

(2) 252

(3) 260

(4) 262

(2) nA = Known frequency = 256 Hz, nB = ?

x = 4 bps, which is decreasing after loading (i.e. x↓) also known tuning fork is loaded so nA

Hence nA↓ – nB = x↓ ... (i) → Correct

nBnA↓ = x↓ ... (ii) → Wrong

nB = nAx = 256 – 4 = 252 Hz.

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