Physics

Problem

Monochromatic light of wavelength

250\,\text{nm}

shines on a metal with work function

2.0\,\text{eV}

. What stopping potential must be applied to reduce the photocurrent to zero? a)

5.0\,\text{V}

2.5\,\text{V}

3.0\,\text{V}

2.0\,\text{V}