Physics

Problem

Light of energy

4.1\,\text{eV}

per photon falls on a sodium surface whose work function is

2.3\,\text{eV}

. What is the maximum kinetic energy of the emitted photo-electrons? a)

6.4\,\text{eV}

4.1\,\text{eV}

1.8\,\text{eV}

2.3\,\text{eV}