In a historical experiment to determine Planck’s constant, a metal surface was irradiated with light of different wavelengths. The emitted photoelectron energies were measured by applying a stopping potential. The relevant data for the wavelength ( λ ) of incident light and the corresponding stopping   potential  V0 are given below:Given that c=3×108ms−1 and e=1.6×10−19C , Planck's constant (in units of J s ) found  from such an experiment is