Wave Mechanics Beats Question 25
Question: Two tuning forks have frequencies 380 and 384 Hz respectively. When they are sounded together, they produce 4 beats. After hearing the maximum sound, how long will it take to hear the minimum sound
[MP PMT/PET 1998]
Options:
A) $ \frac{1}{2} $ sec
B) $ \frac{1}{4} $ sec
C) $ \frac{1}{8} $ sec
D) $ \frac{1}{16} $ sec
Show Answer
Answer:
Correct Answer: C
Solution:
Beat period $ T=\frac{1}{n _{1}\tilde{\ }n _{2}}=\frac{1}{384-380}=\frac{1}{4}\sec $ .
Hence minimum time interval between maxima and minima $ t=\frac{T}{2}=\frac{1}{8}\sec .
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BETA
