A) \[4\times {{10}^{11}}Hz\]
B) \[5\times {{10}^{14}}Hz\]
C) \[8\times {{10}^{15}}Hz\]
D) \[8\times {{10}^{10}}Hz\]
Correct Answer: C
Solution :
Key Idea:\[{{W}_{0}}=h{{v}_{0}}\] where \[{{W}_{0}}=\] work function\[=3.13\,\,eV\] \[{{W}_{0}}=h{{v}_{0}}\] or \[{{v}_{0}}=\frac{{{W}_{0}}}{h}=\frac{3.13\times 1.6\times {{10}^{-19}}}{6.6\times {{10}^{-34}}}\] \[=0.758\times {{10}^{14}}Hz\] \[\therefore \]Threshold frequency\[({{v}_{0}})\simeq 8\times {{10}^{15}}Hz\]
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