Potassium has a work function of

PHYSICS · Multi-part · CBSE · Physics · Dual Nature of Radiation and Matter · Dual Nature of Radiation and Matter

Problem

Potassium has a work function of 3.2 eV3.2\,\text{eV}. It is illuminated with monochromatic light. (i) Calculate the threshold frequency for potassium. (ii) Determine the corresponding threshold wavelength. (iii) Will light of wavelength 450 nm450\,\text{nm} produce photo-electrons from potassium? Give a quantitative reason for your answer. (Take h=6.63×10−34 J sh = 6.63\times10^{-34}\,\text{J s}, c=3.00×108 m s−1c = 3.00\times10^{8}\,\text{m s}^{-1}, 1 eV=1.6×10−19 J1\,\text{eV} = 1.6\times10^{-19}\,\text{J}.)

Related theory

Browse the problem library