Dual Nature Of Radiation

In a photoelectric experiment, a graph of maximum kinetic energy \((\mathrm{KE}_{\text {max }})\) against the frequency of incident radiation (v) is plotted. If \(\mathrm{A}\) and \(\mathrm{B}\) are the intercepts on the \(\mathrm{X}\) and \(\mathrm{Y}\) axis respectively then the Planck's constant is given by