A) \[\text{1}.\text{3}\times \text{1}{{0}^{\text{9}}}\]
B) \[\text{1}.\text{3}\times \text{1}{{0}^{\text{18}}}\]
C) \[\text{1}.\text{3}\times \text{1}{{0}^{\text{27}}}\]
D) \[\text{3}.\text{9}\times \text{1}{{0}^{\text{18}}}\]
Correct Answer: B
Solution :
\[E=n\frac{hc}{\lambda }\] \[n=\frac{E\lambda }{hc}\] \[=\frac{0.39\times {{10}^{-9}}\times 662.6}{6.626\times {{10}^{-34}}\times 3\times {{10}^{8}}}\] \[=1.3\times {{10}^{18}}\]
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