A) \[4500\text{ }\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[1700\text{ }\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) \[2800\text{ }\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) \[3000\text{ }\overset{\text{o}}{\mathop{\text{A}}}\,\]
Correct Answer: D
Solution :
As \[E(eV)=\frac{12375}{\lambda (\overset{\text{o}}{\mathop{\text{A}}}\,)}\] \[4.125=\frac{12375}{\lambda }\] \[\lambda =\frac{12375}{4.125}\] \[=3000\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
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