A) 180 m/s
B) 240 m/s
C) 480 m/s
D) 720 m/s
Correct Answer: C
Solution :
Path difference \[\Delta =\frac{\lambda }{2\pi }\times \varphi \] Þ \[1=\frac{\lambda }{2\pi }\times \frac{\pi }{2}\]Þ l = 4m Hence \[v=n\lambda \]= \[120\times 4=480\] \[m/s\]You need to login to perform this action.
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