Light of threshold frequency just causes photo-emission from a metal

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

Problem

Light of threshold frequency

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

just causes photo-emission from a metal. Calculate the work function of the metal in electron-volt. (Take

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

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