Physics

Problem

Ultraviolet radiation of wavelength

250\,\text{nm}

falls normally on a potassium surface. The work function of potassium is

2.30\,\text{eV}

. Use

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

c = 3.0\times10^{8}\,\text{m\,s}^{-1}

and

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

. a. (i) Convert the photon energy into electron-volt. b. (ii) Find the maximum kinetic energy of the emitted electrons in (a) joule and (b) electron-volt. c. (iii) Calculate the corresponding stopping potential.

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