Answer to Question #79691 in Physics for Anuj

Question

If the threshold wavelength for photoelectric effect on sodium metal is 5000A0, find its work function.

Answer 1

We can find the work function of the sodium metal from the formula:
W_0=hf_0=hc/λ_0 =(6.626∙〖10〗^(-34) J∙s∙3.0∙〖10〗^8 m/s)/(5000∙〖10〗^(-10) m)==4.0∙〖10〗^(-19) J∙(1 eV)/(1.6∙〖10〗^(-19) eV)=2.5 eV.