 <![CDATA[<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0072509856/220722/chapter3.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (176.0K)</a>]]> | - Light can be thought of either as a wave of energy or a stream of particles called photons.
- White light is a mix of all colors.
- The color of light is determined by its wavelength.
- Atoms can emit light when their electrons shift orbits.
- Each kind of atom emits light at a unique set of wavelengths (colors).
- For many kinds of objects, the color and intensity of their light are set by their temperature:
- The hotter the object, the bluer the light it emits.
- The hotter the object, the more light it emits.
- These properties allow us to deduce an object’s temperature from its color.
- The wavelengths of the radiation emitted by a moving object are shifted.
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