Wave Mechanics Question 912
Question: On sounding tuning fork A with another tuning fork B of frequency 384 Hz, 6 beats are produced per second. After loading the prongs of A with some wax and then sounding it again with B, 4 beats are produced per second. What is the frequency of the tuning fork A
[MP PMT 2000]
Options:
A) 388 Hz
B) 380 Hz
C) 378 Hz
D) 390 Hz
Show Answer
Answer:
Correct Answer: D
Solution:
nA = ?, nB = 384 Hz x = 6 bps, which is decreasing (from 6 to 4) i.e. x¯ Tuning fork A is loaded so nA¯ Hence nA¯ ? nB = x¯ Correct nB ? nA¯ = x¯ Wrong
Therefore nA = nB + x = 384 + 6 = 390 Hz.
BETA
