Wave Mechanics Beats Question 6
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
[CPMT 1976; RPET 1998]
Options:
A) 250
B) 252
C) 260
D) 262
Show Answer
Answer:
Correct Answer: B
Solution:
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 nB ? nA¯ = x¯ …
(ii) Wrong
Therefore nB = nA ? x = 256 ? 4 = 252 Hz.
BETA
