A) \[1.5\times {{10}^{35}}\]
B) \[1.5\times {{10}^{31}}\]
C) \[1.5\times {{10}^{29}}\]
D) \[1.5\times {{10}^{33}}\]
Correct Answer: B
Solution :
Number of photons \[=\frac{P}{E}\] \[=\frac{P\lambda }{hc}=\frac{10\times {{10}^{3}}\times 300}{\begin{align} & 6.6\times {{10}^{-34}}\times 3\times {{10}^{8}} \\ & =1.5\times {{10}^{31}} \\ \end{align}}\]
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