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:
λ(μm)0.30.40.5V0(Volt)2.01.00.4
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