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Properties of Light

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by

Jillian Hood

on 4 May 2011

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Transcript of Properties of Light

Properties of Light Electromagnetic waves- an energy-carrying wave emitted by a vibrating charge that is composed of oscillating electric and magnetic fields that regenerate one another. For example: shaking an electrically charged rod back and forth in empty space will produce electricmagnetic waves in space since the moving charge is actually an electric current. There is only one speed for which the electric and magnetic fields stay in perfect balance. Electromagnetic Wave Velocity- gravity can change the frequency of light BuT it can't change the speed of light James Maxwell discovered that light is electromagnetic radiation Electric Spectrum is a continous range of waves extending from radio waves to gamma waves. electromagnetic waves have been detected with the frequency as low as 0.01 hertz. The highest frequecy of visible light are nearly twice the frequency of red and appear violet Materials like glass and water allow light to pass through in straight lines and are transparent to light. The vibration of electrons build up to large multitudes -light travels at different average speeds through different materials Infared waves with frequencies lower than those of visible light, vibrate not only through the electrons but the entire molecules in the glass structure The vibration increases the internal energy and temperature of the structure which is why infrared waves are called heat waves. opaque objects absorb light without re-emitting. Metals are opaque since the outer electrons of atoms in metals are not bound to any atom. Shadows are a region where light rays cannot reach a total shadow is an umbra and a partial shadow is called a penumba appears where some of the light is blocked and where other light fills it Both the earth and moon cast shadows when sunlight is incident upon them. light enters the eye through the transparent cover called the cornea. About 70% of the necessary bending of the light passes through the pupil The End (8
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