wave_mechanics critical_thinking Question 26
Question: Two identical wires have the same fundamental frequency of 400 Hz. when kept under the same tension. If the tension in one wire is increased by 2% the number of beats produced will be
[JIPMER 1999]
Options:
A) 4
B) 2
C) 8
D) 1
Show Answer
Answer:
Correct Answer: A
Solution:
$ n\propto \sqrt{T} $
Therefore $ \frac{\Delta n}{n}=\frac{1}{2}\frac{\Delta T}{T} $ Beat frequency $ =\Delta n=( \frac{1}{2}\frac{\Delta T}{T} )n=\frac{1}{2}\times \frac{2}{100}\times 400=4 $
BETA
