d
(D)  \({{1\, eV  =  1}}{{.602 }} \times {\text{ 1}}{{\text{0}}^{{\text{ - 19}}}}{\text{ J}}\,\,\,\,\,\,\therefore \,\,{{ 2\,eV  =  3}}{\text{.204 }} \times {\text{ 1}}{{\text{0}}^{{\text{ - 19}}}}{\text{ J  =  E}}\)

તરંગ લંબાઈ \({\text{(}}\lambda {\text{) : E}}\,\, = \,\,\frac{{{\text{hc}}}}{\lambda }\) અથવા \( \lambda \,\, = \,\,\frac{{hc}}{E}\)

\(\lambda \,\, = \,\,\frac{{6.626 \times {{10}^{ - 34}}\,Js \times 3 \times {{10}^8}\,m{s^{ - 1}}}}{{3.204 \times {{10}^{ - 19}}\,J}}\,\, = \,\,6.204 \times {10^{ - 7}}\,m\)

આવૃતિ \((v):\,\,v = \frac{c}{\lambda }\,\,\,\,\, = \,\,\frac{{3 \times {{10}^8}\,m{s^{ - 1}}}}{{6.204 \times {{10}^{ - 7}}\,m}}\,\,\,\,\, = \,\,0.48 \times {10^{15}}{\,s^{ - 1}}\,\,\,\, = 4.8 \times {10^{14}}{\,s^{ - 1}}\)