A) zero
B) \[\frac{\pi }{2}\]
C) \[\pi \]
D) \[\frac{3\pi }{4}\]
Correct Answer: D
Solution :
Beat period \[=\frac{1}{30-20}=0.2\,s\] \[\Delta \phi =\frac{2\pi }{T}.\Delta t=\frac{2\pi }{0.1}\times 0.6\] \[=2\pi \times 6=12\pi \]or zero
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