A) \[2840\,\overset{o}{\mathop{A}}\,\]
B) \[0.414\,\overset{o}{\mathop{A}}\,\]
C) \[2.14\,\overset{o}{\mathop{A}}\,\]
D) \[1.78\,\overset{o}{\mathop{A}}\,\]
Correct Answer: B
Solution :
As \[eV=\frac{hc}{{{h}_{\min }}}\] \[\Rightarrow \] \[{{\lambda }_{\min }}=\frac{hc}{eV}=\frac{6.67\times {{10}^{-34}}\times 3\times {{10}^{8}}}{1.6\times {{10}^{-19}}\times 30\times {{10}^{3}}}\] \[=\frac{12.5}{30}\overset{o}{\mathop{A}}\,=0.414\,\overset{o}{\mathop{A}}\,\]
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