Light described by the equation falls on a metal surface with work function

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

Problem

Light described by the equation

E=(100\text{ V m}^{-1})[\sin((5\times10^{15}\text{ s}^{-1})t)+\sin((8\times10^{15}\text{ s}^{-1})t)]

falls on a metal surface with work function

2.0\text{ eV}

. Calculate the maximum kinetic energy of the photoelectrons.