A) \[1.5\times {{10}^{20}}\]
B) \[6\times {{10}^{18}}\]
C) \[62\times {{10}^{20}}\]
D) \[3\times {{10}^{19}}\]
Correct Answer: A
Solution :
Efficient power \[p=\frac{N}{\tau }\times \frac{hc}{\lambda }=200\times 0.25\] \[\frac{N}{\tau }=50\times \frac{\lambda }{hc}=1.5\times {{10}^{20}}\] \[=\frac{50\times 0.6\times {{10}^{-6}}}{6.6\times {{10}^{-34}}\times 3\times {{10}^{8}}}\]
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