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Photoelectric effect
The photoelectric effect refers to the emission of electrons from a metal surface when light or other electromagnetic radiation shines on it.
Stopping voltage
The stopping voltage is the voltage required to repel all emitted electrons, stopping the current.
Threshold frequency
The threshold frequency $f_{\text{c}}$ is the minimum frequency of light required to eject electrons.
Work function
Work function $\phi$ is the minimum quantity of energy which is required to remove an electron from the surface of a given solid.