Wave Mechanics Beats Question 14
Question: Two tuning forks A and B vibrating simultaneously produce 5 beats. Frequency of B is 512. It is seen that if one arm of A is filed, then the number of beats increases. Frequency of A will be
[MP PMT 1991]
Options:
A) 502
B) 507
C) 517
D) 522
Show Answer
Answer:
Correct Answer: C
Solution:
After filling frequency increases, so $ n _{A} $ decreases (¯).
Also it is given that beat frequency increases (i.e., x ) Hence nA¯ ? nB = x …
(i) Correct nB ? nA = x …
(ii) Wrong
Therefore nA = nB + x = 512 + 5 = 517 Hz.
BETA
