P219lecture14emwaves - Goal To understand electromagnetic...

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Goal: To understand electromagnetic waves. Objectives: 1) to learn that the term electromagnetic wave is scarier sounding than it actually is 2) to understand how accelerating charges emit light 3) To learn about the electromagnetic spectrum 4) To understand the speed of light
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Electromagnetic waves Are just a fancy way of saying light waves. However, this “light” isn’t just the light that we can see. It turns out that light comes in a lot of forms.
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Properties of light Light can act like either a particle or a wave. Most commonly acts like a wave. Like waves you are familiar with, light waves have a wavelength and energy. Energy ~ speed of light / wavelength
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Which of the following would emit light waves? Dentist X-ray machine An outgoing radio tower Radar machine The Earth Neon sign All of the above None of these
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Spectrum of Electromagnetic Radiation Region Wavelength (Angstroms) Wavelength (centimeters) Frequency (Hz) Energy (eV) Radio
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