Formula: Photoelectric Effect Energy    Frequency    Voltage    Planck's Constant

Formula: Photoelectric Effect
Capacitor with set stopping voltage for photoelectric effect
Photons with different frequency
Straight line in the energy-frequency diagram results in the photoelectric effect

Work function

Work function is the energy that must be spent to eject an electron from a solid (e.g. from a metal plate). It is usually expressed in units of "eV" (electronvolt).


Frequency of the light with which, for example, a metal plate is illuminated.

Stopping voltage

Back voltage is the voltage between two capacitor plates. This voltage is adjusted so that the electrical energy \(e \, U_{\text G} \) exactly compensates the kinetic energy of the ejected electron.

Elementary charge

The elementary charge is a physical constant and is the smallest, freely existing electric charge in our universe. It has the exact value: $$ e ~=~ 1.602 \, 176 \, 634 ~\cdot~ 10^{-19} \, \mathrm{C} $$

Planck's Constant

Planck's constant is a physical constant and has the value: $$ h ~=~ 6.626 \, 070 \, 15 \, \cdot \,10^{-34} \, \mathrm{Js} $$

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