A) \[32\times {{10}^{-4}}m\]
B) \[30\times {{10}^{-4}}cm\]
C) \[33\times {{10}^{-4}}mm\]
D) \[16\times {{10}^{-3}}m\]
Correct Answer: A
Solution :
Radius of half period zone \[{{r}_{n}}=\sqrt{dn\,\lambda }\] \[\therefore \] \[{{r}_{4}}=\sqrt{9\times 4\times 6400\times {{10}^{-10}}}\] \[=32\times {{10}^{-4}}m\]You need to login to perform this action.
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