A) \[4\times {{10}^{-20}}\]
B) \[1.5\times {{10}^{20}}\]
C) \[3\times {{10}^{-20}}\]
D) \[2\times {{10}^{20}}\]
E) \[1\times {{10}^{-20}}\]
Correct Answer: D
Solution :
Energy, \[E=\frac{nhc}{\lambda }\] \[\Rightarrow \]\[60\times 1\,Js=\frac{n\times 6.63\times {{10}^{-34}}Js\times 3\times {{10}^{8}}m}{663\times {{10}^{-9}}m}\] \[\left[ \because power=\frac{energy}{time} \right]\] \[\therefore \] \[n=\frac{60\times 1\times 663\times {{10}^{-9}}}{6.63\times {{10}^{-34}}\times 3\times {{10}^{8}}}\] \[=2\times {{10}^{20}}\]
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