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Q.

Two tuning forks, A and B, give 4 beats per second when sounded together. The frequency of A is 320 Hz. When some wax is added to B and it is sounded with A, 4 beats per second are again heard. The frequency of B is

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a

312 Hz

b

316 Hz

c

324 Hz

d

328 Hz

answer is C.

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Detailed Solution

nA – nB↓ = x (same)          ... (i)        →       WrongnB↓  – nA = x (same)         ... (ii)       →       Correct⇒ nB = nA + x = 320 + 4 = 324 Hz.
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