Baby don’t hurt me, no more.

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Presentation transcript:

Baby don’t hurt me, no more. What is Light? Baby don’t hurt me, no more.

Learning goals We are learning the different ways light is produced.

Sources of Light Incandescence Phosphorescence Chemiluminescence Triboluminescence “Lasers” Electric Discharge Fluorescence Bioluminescence Light Emitting Diodes

Incandescence The production of light from an object that is at a very high temperature. Hot coals, typical light bulb, sparks, sun, candle

Electric Discharge Producing light by passing electric current through air or gas. Lightning Different gases produce different colours Neon is red orange Argon is violet to lavender blue Nitrogen is more pink

Phosphorescence light produced when a substance absorbs light then emits it slowly over time Generally UV light which is absorbed Glow in the dark stickers

Fluorescence Light produced when a substance is exposed to electromagnetic radiation (UV radiation) CFL light bulbs Rocks/minerals Bulbs are filled with a small amount of gas, which releases UV light when electricity is applied. This UV light hits the phosphor coating and causes it to glow and produce light.

Chemiluminescence Light produced by a chemical reaction no increase in temperature Cool light Glow sticks!

Bioluminescence Chemiluminescence in living organisms Jellyfish and the firefly!! Firefly’s glow due to chemical reaction of oxygen and the enzyme luciferase

Triboluminescence Light produced by friction specifically in crystals through the breaking of chemical bonds in the material. Lifesavers in the dark – does it make a spark!? Peeling two pieces of duct tape apart

Light Emitting Diode (LED) electroluminescence a material emits light after passing an electric current through it. Christmas lights – doesn’t emit heat, doesn’t require a filament, more energy efficient.

“Laser” Laser Video Light Amplified by Stimulated Emission of Radiation Electromagnetic waves emitted exactly the same (direction and energy) Pure in colour, very intense and concentrated into one narrow beam.

Learning goals We are learning the different ways light is produced.

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