Question

For a photon of energy hv to eject an electron from a material with work function $\varphi$, the photon's energy must be

• A. Greater that $\varphi$
• B. Less than $\varphi$
• C. Less than maximum kinetic energy
• D. Equal to maximum kinetic energy

Answer 1

The correct option is A Greater that $\varphi$

Work function is the minimum energy required to eject an electron from the surface.

So the photon's energy should be greater than work function $\varphi$ to eject an electron.