. In a historical experiment to determine Planck’s constant, a metal

In a historical experiment to determine Planck’s constant, a metal surface was irradiatedwith light of different wavelengths. The emitted photoelectron energies were measured byapplying a stopping potential. The relevant data for the wavelength (λ) of incident lightand the corresponding stopping potential (V₀) are given below:

Given that c = 3 × 10⁸ m s^-1 and e = 1.6 × 10^-19 C, Planck’s constant (in units of J s)found from such an experiment is