Monochromatic radiation of wavelength is incident on a potassium surface having work…

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

Problem

Monochromatic radiation of wavelength

400\,\text{nm}

is incident on a potassium surface having work function

2.0\,\text{eV}

. (Use

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

c = 3.0\times10^{8}\,\text{m s}^{-1}

1\,\text{eV}=1.6\times10^{-19}\,\text{J}

.) Calculate the maximum kinetic energy of the emitted electrons. (a)

3.1\,\text{eV}

(b)

0.57\,\text{eV}

(c)

1.1\,\text{eV}

(d)

5.1\,\text{eV}