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 (A) 250 (B) 252 (C) 260 (D) 262

Tardigrade Admin · Accepted Answer

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

Q. 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

$250$

$252$

$260$

$262$

Q. 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

Q. 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

$250$

$252$

$260$

$262$