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The photoelectric experiment (photons shined on a metal surface which ejected electrons) showcases the particle property of electrons. For the wave property of electrons, I don't know the name, but I think the experiment involved particles passing through a hole in a wall, then a detector at the end found patterns of waves.
In the photoelectric effect, it was found that electrons behaved as particles. After doing a quick internet search, I found that the experiment that found that electrons have some wave-like properties was the double-slit experiment by Thomas Young.
An easy way to remember that electrons behave as particles in the photoelectric experiment is to remember that when intensity of light was increased, it did not help to remove any more electrons from the metal. Here, increasing intensity of light increased the wavelength which had no effect on the electrons emitted. If light only had wavelike properties, than the increasing intensity should have ejected electrons. However, frequency of light is at play, where increasing the frequency increases the energy of the photon as shown by the equation E=hv, which then helps the electron be emmited. This electron is measure using its kinetic energy, which can be taken of particles themselves rather than waves.
in lecture 5 (todays lecture), lavelle explains the properties of electrons and how they have wave-like behavior in the photoelectric experiment. the module on the chem 14a website titled "wave properties and the debrogile equation" is very helpful for understanding when and how objects and particles behave like waves
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