Question

Carbon has a work function of 5.0 eV. When monochromatic light of frequency 3.22 1015 Hz is shined onto a carbon surface, what is the maximum velocity of the photoelectrons that are released? Let 1 eV 1.60 10 , the mass of an electron m 9.11 x 10-31 kg, and Planck's constant h = 4.136 10-15 eV s.

Answer 1

On my phone, apologies for formatting

KE = (hf) - W

Where KE is the kinetic energy of the releases electrons, hf is plancks constant times frequency, and W is the work function

Evaluate KE

From there, KE = (1/2)mv^2 and you can solve for the velocity of the electron