When a given photosensitive material is irradiated with light of frequency `nu`, and maximum speed of the emitted photo-electrons equals `v_(max)`. The square of `v_(max)`is observed to vary with `v`, as per the graph shown in fig. Obtain expression for
(i) Planck's constant and
(ii) the work function of the given photosensitive material, in terms of the parameter `l`, `n` and the mass `m` of the electrons.