Monochromatic light of wavelength shines on a metal with work function

PHYSICS · Single correct · A Level · Physics · Particles and radiation · Particles and radiation

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}

(b)

2.5\,\text{V}

(c)

3.0\,\text{V}

(d)

2.0\,\text{V}