PHOTOELECTRIC EFFECT ANIMATION

This poweroint enables students to visualize the photoelectric effect. It therefore would make a good introduction to this difficult concept.

This PowerPoint shows photons hitting a metal surface in a vacuum and the subsequent behaviour of the free electrons in the metal.
It shows how red photons hitting a metal surface gives no photoemission even if the light intensity is increased and points out that the energy of a photon depends on its frequency. Green photons, of the threshold frequency, just cause the least tightly held electrons to reach the surface with no kinetic energy and a more intense green light causes this to happen more quickly but does not increase the energy of the photons.
When blue photons are used the photoelectrons are emitted with a range of speeds and the least tightly held electrons leave with the maximum kinetic energy.
It also shows that the brighter the blue light the more photoemissions per second.
It defines Work Function and derives Einstein’s Photoelectric Equation.