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Glossary

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List of terms beginning with El

Electromagnetic radiation (EMR)

Energy transmitted in the form of combined electric and magnetic waves. Includes (in order of increasing frequency and energy, and decreasing wavelength): radio waves; microwaves; infrared light; visible light; ultraviolet (UV) radiation; x-rays; gamma rays. Visible light is the only form of electromagnetic radiation that we can see with our eyes.

Electron

Tiny negatively charged particles that make up the outer shells of atoms and are responsible for the flow of electricity down wires.