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Experiments · High school and university

Photoelectric tube

Change the wavelength, the intensity and the metal: it is the photon’s energy, not the intensity, that frees electrons.

In the learning section below the figure, predict, try, complete the tasks and check yourself with short questions.

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  • ExperimentsHigh school and university

    The gold foil experiment

    Fire alpha particles at gold foil; swing the detector, count the ones that bounce back and trace the nucleus.

  • ExperimentsHigh school and university

    Millikan’s oil drop experiment

    Adjust the voltage, hold the drop still in the microscope and work out the charge of the electron yourself.