d
(d). \(\because {V_0} = \left( {\frac{h}{e}} \right)\,\nu  - \left( {\frac{{{W_0}}}{e}} \right)\)From the graph \({V_2} > {V_1}\)

==> \(\frac{{h{\nu _2}}}{e} - \frac{{{W_0}}}{e} > \frac{{h{\nu _1}}}{e} - \frac{{{W_0}}}{e}\)

==> \({\nu _2} > {\nu _1}\)

==> \({\lambda _1} > {\lambda _2}\) (as \(\lambda \propto \frac{1}{\nu }\))