Light of frequency is incident on a metallic surface whose work function is

PHYSICS · Subjective · A Level · Physics · Particles and radiation · Particles and radiation

Problem

Light of frequency

7.0\times10^{14}\,\text{Hz}

is incident on a metallic surface whose work function is

2.2\,\text{eV}

. Calculate the magnitude of the potential difference that must be applied between the emitter and the collector to reduce the photocurrent to zero.