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Sources of lightWhat sources of light can you think of?Can you distinguish between “luminous” and
“non-luminous” objects? Which is the Sun? The Moon?
fluorescenceLight is emitted by substances
when exposed to electromagnetic radiation
More complicated: gas particles emit UV light, which make a phosphor emit light
fluorescent lightbulbs
phosphorescenceThe ability to store energy from a source of light
and then emit it slowly over a long period Like florescence, but slowerglow-in-the-dark items
electric dischargeLight is produced by passing electricity through
the air or another gaslightningneon signs
chemiluminescenceLight produced from a chemical reaction without
a rise in temperatureglow sticksluminolBioluminescence is a natural form