Radiation of frequency is incident on potassium whose work function is

PHYSICS · Subjective · CBSE · Physics · Dual Nature of Radiation and Matter · Dual Nature of Radiation and Matter

Problem

Radiation of frequency

9.0\times10^{14}\,\text{Hz}

is incident on potassium whose work function is

2.2\,\text{eV}

. Calculate the maximum kinetic energy liberated per mole of emitted electrons. Express your answer in kJ mol

^{-1}

. (Take

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

;

N_A = 6.02\times10^{23}\,\text{mol}^{-1}

;

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