Wave Mechanics Beats Question 19
Question: When a tuning fork A of unknown frequency is sounded with another tuning fork B of frequency 256 Hz, then 3 beats per second are observed. After that A is loaded with wax and sounded, the again 3 beats per second are observed. The frequency of the tuning fork A is
[MP PMT 1994]
Options:
A) 250 Hz
B) 253 Hz
C) 259 Hz
D) 262 Hz
Show Answer
Answer:
Correct Answer: C
Solution:
It is given that nA = Unknown frequency = ? nB = Known frequency = 256 Hz x = 3 bps, which remains same after loading Unknown tuning fork A is loaded so nA¯ Hence nA¯ ? nB = x …
(i) Correct nB ? nA¯ = x …
(ii) Wrong
Therefore nA = nB + x = 256 + 3 = 259 Hz.
BETA
