a
(A) જાંબલી પ્રકાશ \( {{\text{E}}_{{\text{violet}}}} = \frac{{hc}}{\lambda }\,\,\,\,\)

\({E_{violet}} = \frac{{6.626 \times {{10}^{ - 34}}Js \times 3 \times {{10}^8}m{s^{ - 1}}}}{{4000 \times {{10}^{ - 10}}m}}\,\, = \,\,4.97 \times {10^{ - 19}}J\)

લાલ પ્રકાશ \(: \,{E_{red}}\,\, = \,\,\frac{{hc}}{\lambda }\)

\({E_{red}}\,\, = \,\,\frac{{6.626 \times {{10}^{ - 34}}Js \times 3 \times {{10}^8}m{s^{ - 1}}}}{{7000 \times {{10}^{ - 10}}m}}\,\, = \,\,2.8 \times {10^{ - 19}}J\)

\( \Rightarrow \,\,\,{E_{violet}} > {E_{red}}\)