A) \[4000\overset{\text{o}}{\mathop{\text{A}}}\,,\,\,7500\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[5500\overset{\text{o}}{\mathop{\text{A}}}\,,\,6000\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) \[4000\overset{\text{o}}{\mathop{\text{A}}}\,,\,6000\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) None of the above
Correct Answer: D
Solution :
Threshold wavelength \[{{\lambda }_{0}}=\frac{12375}{2.1}=5892.8\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
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