A) 1
B) 2
C) 3
D) 4
Correct Answer: C
Solution :
\[2\pi \,r\,n=\lambda \Rightarrow n=\frac{\lambda }{2\pi \,r}=\frac{{{10}^{-9}}}{2\times 3.14\times 5.13\times {{10}^{-11}}}=3\]
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