A) \[0.62\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[0.37\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) \[1.62\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) \[1.31\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
Correct Answer: A
Solution :
From relation \[\frac{hc}{{{\lambda }_{\min }}}=eV\] or \[{{\lambda }_{\min }}=\frac{hc}{eV}\] or \[{{\lambda }_{\min }}=\frac{6.6\times {{10}^{-34}}\times 3\times {{10}^{8}}}{1.6\times {{10}^{-19}}\times 20\times {{10}^{3}}}\] \[=0.62\times {{10}^{-10}}m\] \[=0.62\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
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