A) \[2955\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[4200\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) \[2000\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) \[1000\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
Correct Answer: A
Solution :
If \[{{\lambda }_{0}}\] is threshold wavelength, then work function \[{{\phi }_{0}}=\frac{hc}{{{\lambda }_{0}}}\] \[\Rightarrow \] \[{{\lambda }_{0}}=\frac{hc}{{{\phi }_{0}}}\] \[=\frac{6.6\times {{10}^{-34}}\times 3\times {{10}^{8}}}{4.2\times 1.6\times {{10}^{-19}}}\] \[=2955\overset{\text{o}}{\mathop{\text{A}}}\,\]
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