The work function of a certain metal is ? = 2.55 eV. Determine the minimum frequency of light f0 for which photoelectrons are emitted from the metal. (Planck's constant is: h = 4.1357×10-15 eVs.)
6.17×1014 Hz
Determine the corresponding wavelength of light. (Possibly useful constant: hc = 1240 eVnm.)
4.87×102 nm
Need help on last part
Calculate the kinetic energy of the emitted electrons if the frequency of the photons is doubled to 2f0.