# Photoelectric Effect. And the Einstein's Formula.

Photoelectric effect and everything you need to know about it.

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Here you will learn in detail what the photoelectric effect is all about. First, we'll look at how the experiment is set up, then we'll move on to photons and photon energy. Then we will send a photon towards a metal plate to release an electron from it. Here you will learn about work function and cutoff frequency and how to calculate them. Using two examples of work function, we will convert electron volts to joules and vice versa.

The ejected electron has kinetic energy. We take this into account when deriving the Einstein formula with the help of the conservation of energy. Afterwards, we use the stopping voltage to rewrite the Einstein formula.

At the end, we illustrate the statement of the photoelectric effect with a graph. From this graph you can determine the value of Planck's constant.

Video content:

00:00 What is the photoelectric effect? 00:07 Experiment setup 00:46 Photons 01:58 Work function and threshold frequency 03:48 Convert electron volts to joules and vice versa 04:19 Kinetic energy of an electron 04:50 Einstein formula 05:36 Stopping (braking) voltage 07:20 Energy frequency graph

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- Kind: Short
- Year: 2022
- Runtime: 8 min
- By: Universaldenker ⚛ Physics
- Genres: Science
- Archive: [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:Photoelectric_Effect._And_the_Einstein%27s_Formula..webm)
- Licence or status: [CC BY 3.0](https://creativecommons.org/licenses/by/3.0) (as the archive states it)
- Credit: Universaldenker ⚛ Physics
- Who can watch: Tweens profiles and older (the archive gives no rating; placed by Invisible Network from its collection and subjects)

[Watch now](https://invisiblenetwork.ai/watch/archive/commons/133101363?play=1)