Introduction to Light.

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Presentation transcript:

Introduction to Light

Sources of light What sources of light can you think of? Can you distinguish between “luminous” and “non-luminous” objects? Which is the Sun? The Moon?

INCANDESCENCE Light caused by heating up a material lightbulbs burning fuel

LUMINESCENCE Light from unheated objects There are many different types …

fluorescence Light is emitted by substances when exposed to electromagnetic radiation More complicated: gas particles emit UV light, which make a phosphor emit light fluorescent lightbulbs

phosphorescence The ability to store energy from a source of light and then emit it slowly over a long period Like florescence, but slower glow-in-the-dark items

electric discharge Light is produced by passing electricity through the air or another gas lightning neon signs

chemiluminescence Light produced from a chemical reaction without a rise in temperature glow sticks luminol Bioluminescence is a natural form

nuclear fusion Light is released when hydrogen atoms are pressed together to form helium the sun!

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