A) \[0.5\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[0.75\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) \[0.25\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) \[1.0\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
Correct Answer: C
Solution :
\[\lambda =\frac{hc}{e\lambda }\] \[=\frac{6.6\times {{10}^{-34}}\times 3\times {{10}^{8}}}{1.6\times {{10}^{-19}}\times 50\times {{10}^{3}}}\] \[\lambda =\frac{1{{9.810}^{-26}}}{80\times {{10}^{-16}}}\] \[=0.25\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
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