Phys_151_PPL12

Phys_151_PPL12 - Let There Be Light Light is a transverse...

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Let There Be Light Light is a transverse wave. Remember the radiation from a warm object? It is now known that they are electromagnetic waves carrying energy - they can be pictured as waves of electric and magnetic fields . The two fields are tilted at right angles to each other. E B Visible light is a member of this “family” of waves, which includes radio waves and x-rays. They differ only In their wavelengths.
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More Light on the Subject Visible light is an EM wave with a wavelength that ranges from 400 (violet) - 700(red) nanometers (10 -9 m). Radio waves 1-100 m; x-rays 1 nanometer. Other properties: they travel in straight lines from source to receiver. in vacuum, they have the same speed, c = 3 x 10 8 m/s (186,000 miles /s). Thus, the different kinds of waves have different frequencies - from wave equation. Radio red violet x-rays long short infra-red ultra-violet when any wave encounters a boundary between two media, it can be reflected (“impenetrable” boundary) or refracted (“penetrable” boundary). We visualize the light as a ray, a construct that makes it easier to explain what happens.
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Phys_151_PPL12 - Let There Be Light Light is a transverse...

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