A) 18o
B) 36o
C) 54o
D) 72o
Correct Answer: D
Solution :
From the given equation \[k=0.2\pi \] Þ\[\frac{2\pi }{\lambda }=0.2\pi \Rightarrow \lambda =10\]cm \[\Delta \varphi =\frac{2\pi }{\lambda }\,\Delta x=\frac{2\pi }{10}\times 2=\frac{2\pi }{5}={{72}^{o}}\,\]
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