Questions

Two tuning forks A and B give 4 beats per second. The frequency of A is 256 Hz. On loading B slightly, we get 5 beats in 2seconds. The frequency of B after loading is

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253.5 Hz

258.5 Hz

260 Hz

252 Hz

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detailed solution

Correct option is C

nA = Known frequency = 256 Hz, nB = ?x = 4 beats per sec which is decreasing (4 bps to 52 bps) after loading (i.e. x↓)Unknown tuning fork B, is loaded so nB↓Hence nA – nB↓ = x↓ ... (i) → Wrong nB↓ – nA = x↓ ... (ii) → Correct ⇒ nB = nA + x = 256 + 4 = 260 Hz.

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