A) \[1.6\times {{10}^{7}}\,\,Hz\]
B) \[8.68\times {{10}^{15}}\,\,Hz\]
C) \[9.68\times {{10}^{17}}\,\,Hz\]
D) \[1.2\times {{10}^{15}}\,\,Hz\]
Correct Answer: D
Solution :
[d] Work function \[({{W}_{0}})\] and the threshold frequency \[({{v}_{0}})\] are related as below \[{{W}_{0}}=h{{v}_{0}}\] \[\therefore \] \[{{v}_{0}}=\frac{{{W}_{0}}}{h}=\,\,\,\,\frac{(5\times 1.6\times {{10}^{-19}})\,V}{(6.625\times {{10}^{-34}})\,Js}\] \[=1.2\times {{10}^{15}}\,Hz\]
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