Question

A light of wavelength a strikes a metal surface
and ejects photoelectrons, with KE = 1eV.
Another light of waveleng ikes the same
metal surface and ejects photoelectrons, with
KE = 4eV. The work function is
1) 1 eV 2) 2 eV 3) 0.5 eV 4) 3 eV​

Answer 1

Answer:

3)0.5 eV may be the answer....... but I am not sure about it!!!