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 these
Correct Answer: D
Solution :
[d] Threshold wavelength \[{{\lambda }_{0}}=\frac{12375}{2.1}=5892.8\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
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