A) Zero
B) p/2
C) p
D) 3p/2
Correct Answer: D
Solution :
\[\frac{\lambda }{4}=20\Rightarrow \lambda =\,80\,cm\], also \[\Delta \varphi =\frac{\lambda }{2\pi }.\,\Delta x\] Þ \[\Delta \varphi =\] \[\frac{60}{80}\times 2\pi =\frac{3\pi }{2}\]
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