Photoelectric Effect: Threshold Frequency · F=ma 2017 #22

Physics · quantum-mechanics

Problem

Light of wavelength

\lambda = 250\;\text{nm}

ejects electrons from a metal surface with maximum kinetic energy

K_{\max} = 1.2\;\text{eV}

. Find the work function of the metal and the threshold wavelength. Use

hc = 1240\;\text{eV}\cdot\text{nm}