A) 8
B) 7
C) 4
D) 2
Correct Answer: B
Solution :
[b] \[{{f}_{o}}-{{f}_{c}}=2\] or \[\frac{v}{2l}-\frac{v}{4l}=2\] or \[\frac{v}{4l}=2\] or \[\frac{v}{l}=8\] When length of OOP is halved and that of COP is doubled, the beat frequency will be \[{{f}_{o}}'-{{f}_{c}}'=\frac{v}{l}-\frac{v}{8l}=\frac{7}{8}\frac{v}{l}=\frac{7}{8}\times 8=7\]You need to login to perform this action.
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