A) \[{{10}^{21}}\]
B) \[3.0\times {{10}^{19}}\]
C) \[2.02\times {{10}^{20}}\]
D) \[2.02\times {{10}^{21}}\]
Correct Answer: C
Solution :
Let number of photons emitted per second be\[n\]. Then intensity\[=100\text{ }W/{{m}^{2}}\] \[\frac{nhc}{\lambda }=100\] \[n=\frac{100\times \lambda }{hc}\] \[=\frac{100\times 4000\times {{10}^{-10}}}{hc}\] \[=\frac{100\times 4000\times {{10}^{-10}}}{6.6\times {{10}^{-34}}\times 3\times {{10}^{8}}}\] \[=2.02\times {{10}^{20}}\]
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