A) \[3.0\times {{10}^{16}}\]
B) \[4.0\times {{10}^{15}}\]
C) \[2.0\times {{10}^{14}}\]
D) \[1.0\times {{10}^{13}}\]
Correct Answer: A
Solution :
[a] number of photon\[=\frac{P\times t\times \pi {{r}^{2}}}{hc/\lambda }\]
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