Photoelectric Effect 

This program allows you to see the effect of shining light onto a photocell.. You can....turn the light on and off and see if a current is produced...change the frequency of the light and measure the threshold frequency...see the effect of brightness on the size of the current...understand why the wave theory of light fails to explain the observations and why a particle model is needed.

The experiments show clearly how light of less than the threshold frequency consists of photons that have less energy than the work function and therefore cannot release electrons. It is a very useful teaching aid because it shows the principle of finding the threshold frequency without the difficulties of setting up a delicate experiment. It is also useful for students because it shows clearly and simply the importance of this classic experiment.

To download the program click  'Download'.

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