A) 720 m/s
B) 384 m/s
C) 250 m/s
D) 1 m/s
Correct Answer: B
Solution :
Phase difference \[=\frac{2\pi }{\lambda }\]´ path difference \[\Rightarrow \frac{\pi }{2}=\frac{2\pi }{\lambda }\times 0.8\]\[\Rightarrow \lambda =4\times 0.8=3.2\,m\] Velocity \[v=n\lambda \]\[=120\times 3.2=384\,m/s.\]You need to login to perform this action.
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