Light of wavelength shines on a sodium surface whose work function is

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

Problem

Light of wavelength

400\,\text{nm}

shines on a sodium surface whose work function is

2.28\,\text{eV}

. Determine the maximum kinetic energy of the emitted electrons. For calculations, use

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

c=3.00\times10^{8}\,\text{m/s}

, and

1\,\text{eV}=1.60\times10^{-19}\,\text{J}

. (a)

3.10\,\text{eV}

(b)

0.82\,\text{eV}

(c)

1.32\,\text{eV}

(d)

0.41\,\text{eV}