A) 192 m/s
B) 360 m/s
C) 710 m/s
D) 384 m/s
Correct Answer: D
Solution :
Path difference \[\Delta =\frac{\lambda }{2\pi }\times \varphi =\frac{\lambda }{2\pi }\times \frac{\pi }{2}=\frac{\lambda }{4}\] \[\because \,\Delta =0.8\,m\] Þ \[\frac{\lambda }{4}=0.8\,\]Þ l = 3.2 m. \ v = nl = 120 ´ 3.2 = 384 m/sYou need to login to perform this action.
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