Question

The surface of a metal is illuminated with the light of 400 nm wavelength. The kineticenergy of the ejected photoelectron is found to be 1.69 eV. The work function of the metal is

Answer 1

Answer:

Explanation:kinetic energy= hc/wavelength -work function

Use h=4.13×10ki power -15 ev

Answer 2

Answer:

KE = h f - W

W = h f - 1.6 eV

h f = 6.63 * 10E-34 * (3 * 10E8 / 400 * 10E-9) = 4.97 * 10E-19 J

Since 1 eV = 1.6 * 10E-19 J    h f = 3.1 eV

W = 1.5 eV