A) \[36\times {{10}^{-8}}\,m\]
B) \[6\times {{10}^{-8}}\,m\]
C) \[\sqrt{6}\times {{10}^{-8}}\,m\]
D) \[6\times {{10}^{-4}}\,m\]
Correct Answer: D
Solution :
Radius of half period zone\[=\sqrt{nb\lambda }\] Radius of 1st zone \[\begin{align} & =\sqrt{1\times 60\times {{10}^{^{-2}}}\times 6\times {{10}^{-7}}} \\ & =6\times {{10}^{-4}}\,m \\ \end{align}\]
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