The work function of a metal is

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

Problem

2.2\,\text{eV}

. The minimum photon energy required to just eject electrons from its surface is closest to (a)

2.20\times10^{-19}\,\text{J}

(b)

7.04\times10^{-19}\,\text{J}

(c)

3.52\times10^{-19}\,\text{J}

(d)

1.38\times10^{-19}\,\text{J}