A) \[3920\,\overset{o}{\mathop{\text{A}}}\,\]
B) \[1866\,\overset{o}{\mathop{\text{A}}}\,\]
C) \[186.6\,\overset{o}{\mathop{\text{A}}}\,\]
D) \[18666\,\overset{o}{\mathop{\text{A}}}\,\]
Correct Answer: B
Solution :
Work function of a photometal, \[W=\frac{hc}{{{}_{0}}}\]where\[{{\lambda }_{0}}\] is threshold wavelength, \[\therefore \,\,\,\,\,\,\,\,\,{{\lambda }_{0}}\,=\frac{hc}{W}\] \[\begin{align} & =\frac{12375}{(W\,in\,eV)}=\frac{12375}{6.63}\overset{{}^\circ }{\mathop{\text{A}}}\, \\ & =1866\overset{{}^\circ }{\mathop{\text{A}}}\, \\ \end{align}\]
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