lec15(2x2) - White Light A Mixture of Colors(DEMO White...

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10/18/11 1 White Light: A Mixture of Colors ( DEMO ) 10/18/11 2 White Light: A Mixture of Colors ( DEMO ) 1. Add together magenta , cyan , and yellow . Play with intensities of each to get white light. 2. Take look at shadows that result from putting an object in the light path. 10/18/11 3 Spectral Lines Energy states of an atom are discrete and so are the energy transitions that cause the emission of a photon (DEMO) 10/18/11 4 Emission spectra are produced by thin gases (few collisions). The emission lines correspond to photons emitted when excited atomic states in the gas make transitions back to lower-lying levels. C ontinuum spectrum : Solids, liquids, or dense gases emit light at all wavelengths when heated. A bsorption spectrum occurs when light passes through a cold, dilute gas. Atoms in the gas absorb at characteristic frequencies. Re-emitted light is unlikely to be emitted in the same direction ! dark lines in the spectrum.
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10/18/11 5 Dependence of Intensity on Distance Power P av Consider spheres at different radius from the
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