Question

Photoelectric effect

Answer 1

Can anyone explain how it works, when to apply and so on?

Answer 2

photoelectrons = electrons which accepts the energy from photon
photon = packets of energy
Take photocell as an example
When light shines , photons make collision with the electrons. If a photon has energy exactly equal to the difference between any two energy level, the photon transfers energy to an electron. (one-to-one process)
The electron gain energy. If it gains enough energy, it can escape from the object as a form of photoelecton.
That's photoelectic effect. :D
Photoelectric effect can be used in photocell.
When light shines on photocell, the electrons gain energy and escape to reach cathode, current forms.

Answer 3

How does this work?!