A) \[5.9\times {{10}^{-4}}eV\]
B) \[5.9\times {{10}^{-6}}eV\]
C) \[5.9\times {{10}^{-8}}eV\]
D) \[11.8\times {{10}^{-6}}eV\] \[(h=6.62\times {{10}^{-34}}Js;\ \ c=3\times {{10}^{8}}m/s)\]
Correct Answer: B
Solution :
\[E=\frac{hc}{\lambda }=\frac{3\times {{10}^{8}}\times 6.62\times {{10}^{-34}}}{0.21\times 1.6\times {{10}^{-19}}}=5.9\times {{10}^{-6}}eV\]
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