A) 5.38 eV
B) 53.9 eV
C) \[5.39\times {{10}^{-8}}eV\]
D) None of these
Correct Answer: A
Solution :
Work function (W) is defined as the minimum energy required for emission of photo- electrons. It is equal to \[W=\frac{hc}{\lambda }\] Given, \[h=6.6\times {{10}^{-34}}J-s\], \[c=3\times {{10}^{9}}m/s\], \[\lambda =2300\,\overset{o}{\mathop{A}}\,=2300\times {{10}^{-10}}m\] \[\therefore \] \[W=\frac{6.6\times {{10}^{-34}}\times 3\times {{10}^{8}}}{2300\times {{10}^{-10}}\times 1.6\times {{10}^{-19}}}\] = 5.38 eV
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