Physics

Problem

A metal surface has a threshold wavelength of

620\,\text{nm}

. It is exposed to light of wavelength

400\,\text{nm}

. a. (i) Calculate the work function of the metal in electron-volt. b. (ii) Find the maximum kinetic energy of the emitted electrons in joule and in electron-volt. c. (iii) Compute the stopping potential required to block these photo-electrons. (Use

h = 6.63\times10^{-34}\,\text{J s}

c = 3.00\times10^{8}\,\text{m s}^{-1}

e = 1.6\times10^{-19}\,\text{C}

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