Electrons

[Kristine]

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

[Adrian Baker]

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.

[himanshu121]

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

[Njorl]

The classic experiment for determination of electron charge is the Milliken Oil Drop Experiment. Or, as I call it, the Milliken Eye-strain Experiment.

Njorl

[himanshu121]

Yes its true classical method was developed by Milikan

But i read somewhere that he manipulated with his readings , is there any controversy