A) 500 \[\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) 5000 \[\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) 2000 \[\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) 1000 \[\overset{\text{o}}{\mathop{\text{A}}}\,\]
Correct Answer: B
Solution :
[b] By using \[E(eV)=\frac{12375}{\lambda (\overset{\text{o}}{\mathop{\text{A}}}\,)}\] \[\Rightarrow \,\,\lambda \,=\frac{12375}{2.48}=4989.9\,\overset{\text{o}}{\mathop{\text{A}}}\,\,\approx \,5000\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
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