A) \[4000\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[~3500\text{ }\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) \[~2955\text{ }\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) \[~2500\text{ }\overset{\text{o}}{\mathop{\text{A}}}\,\]
Correct Answer: C
Solution :
\[{{W}_{0}}(eV)=\frac{12375}{{{\lambda }_{0}}}\Rightarrow {{\lambda }_{0}}=\frac{12375}{4.2}=2955\overset{\text{o}}{\mathop{\text{A}}}\,\]
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