Original Version of Simulation: https://phet.colorado.edu/sims/cheerpj/photoelectric/latest/photoelectric.html?simulation=photoelectric 

• Start with Sodium Metal

  • • Leave the Voltage setting at 0 V to start

    • Try setting the Intensity to 100%

    • Experiment with different types of radiation (slider button between UV and IR)

    • Once you've spotted the pattern, experiment with different levels of Intensity

  •  Try different metals

  • Try going to "Options", and clicking the box for "Show Photons"

    • • experiment with different levels of intensity

      • experiments with different wavelengths (UV -> IR)

  • Describe how these results lead to the photon model of light: e.g. argue that only a photon model of light can explain why, when light is shining on the metal but there is no current, increasing the frequency will lead to electrons being given off, but increasing the intensity of light or the voltage between the plates will not.