Physics

Problem

Which expression gives the maximum kinetic energy

K_{\text{max}}

of an electron emitted from a metal surface when it is illuminated by monochromatic light of frequency

f

and the metal has work function

\phi

? a)

K_{\text{max}} = hf + \phi

K_{\text{max}} = hf - \phi

K_{\text{max}} = hf

K_{\text{max}} = \dfrac{hf-\phi}{2}