# Photo electric effect relate to determining the charge of an electron?

how does the photo electric effect relate to determining the charge of an electron?

I'm not sure that it does.

The photoelectric effect is where incident photons have sufficient energy to knock electrons out of their captured state - ie ionise the material. Charge is irrelevant here.

If we apply formula for Photoelectric effect i.e.

$$k_{max}=E_{photon}-\phi(work function of metal)$$

now if we are able to stop the fastest moving electron with cuttoff voltage such that $$eV_0 = K_{max}$$
so we can calculate e from above equation

But i'm not sure whether this is applied for charge calculation

Last edited:
Njorl