Physics

Problem

The work function of potassium is

2.3\,\text{eV}

. Calculate the stopping potential when monochromatic light of wavelength

400\,\text{nm}

is incident on the surface. a)

3.1\,\text{V}

0.5\,\text{V}

0.8\,\text{V}

2.3\,\text{V}