b
\({\text{hv}}\) ની મહતમ ક્ષમતા \({{\text{E}}_{\text{g}}}{\text{,}}\) છે કે જેથી

\({\text{h}}\nu \,\, = \,\,\frac{{{\text{hc}}}}{\lambda }\,\, = \,\,{E_g}\)  અને 

\(\lambda \,\, = \,\,\frac{{hc}}{{{E_g}}}\,\, = \,\,\,\frac{{6.63\,\, \times \,\,{{10}^{ - 34}}J\, - \,s\,\, \times \,\,3\,\, \times \,\,{{10}^8}\,m{s^{ - 1}}}}{{0.73\,\, \times \,\,1.6\,\, \times \,\,{{10}^{ - 19}}\,J}}\,\, = \,\,1703\,\,nm\)