A) 736.7 \[\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) 760.7 \[\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) 301 \[\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) 344.4 \[\overset{\text{o}}{\mathop{\text{A}}}\,\]
Correct Answer: D
Solution :
Work function (W)\[=\frac{hc}{\lambda }\Rightarrow \lambda =\frac{hc}{W}\] Threshold wavelength \[(\lambda )=\frac{hc}{W}\] \[=\frac{6.626\times {{10}^{-34}}\times 2.97\times {{10}^{8}}}{5.2\times {{10}^{-18}}}\] \[\cong 344.4\,\overset{\text{o}}{\mathop{\text{A}}}\,.\]
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