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

Question

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, 250, 252, 260, 262

MARKS App · Accepted Answer

Known frequency, n A = 256 Hz Unknown frequency, n B = ? Beats x = 4 bps, which is decreasing after loading (i.e. x decreases) We also know that the tuning fork A is loaded so n A decreases Hence n A - n B = x (decreases) ......(i) Correct n B - n A = x (increases)......(ii) Wrong n B = n A - x = 252 Hz

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