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In this lesson, you will learn how the electron was discovered. We will learn what a cathode ray tube and how applying a voltage across a low pressure gas in the tube produces a glowing beam that was initially called cathode rays. It was discovered that this is really electrons which can be manipulated with external magnets and electric fields. In this way, early scientists could calculate the relative mass of an electron along with the charge on the electron. Now with quantum mechanics we know that electrons also have properties of waves in addition to their particle properties.