Light Energy
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Luminous | Objects that emit light
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| Non-Luminous | Objects that do not emit light (But they can reflect light)
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| Give an example of luminous and non-luminous objects | Luminous - Sun; Non-luminous - Moon
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| Incadesence | Process of emitting light at high temperature (ie: candle, torch, light bulb)
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| Phosphoresence | Process of emitting light after energy has been stored for a short period of time
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| Example of phosphorus object | Glow-in-the-dark stickers
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| Electric Discharge | Process of emitting light by running electricity through a gas
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| Example of electric discharge | Neon lights, lightning
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| Fluoresence | Emitting light while receiving energy from another source - combines electric discharge with phosphoresence
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| Chemiluminescence | Process of changing chemical energy into light energy - produces little or no heat
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| Example of chemiluminescence | Glow sticks
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| Bioluminesence | Light emitted from a living organism - use chemical activity to emit light
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| Example of bioluminescence | Angler fish, fireflys, glow worms
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| How does a fluorescent bulb work? | Electricity runs through mercury vapour. The vapour emits ultra violet light. The ultra violet light will "light up" a phosphorous film on the glass and the bulp glows.
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| How does an incandescent bulb work? | Electricity runs through the filament causing it to heat up and glow.
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| What is the energy transformation for incandescent objects? | Electrical energy --> Thermal energy (heat) --> Light
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| Umbra | Dark part of a shadow
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| Penumbra | Light part of a shadow
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| Shadow | Area where light has been blocked by a solid object
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| Transparency | Measure of how much light can pass through a material
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| Transparent | Materials allow all light to pass through
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| Translucent | Materials allow some light to pass through
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| Opaque | Materials allow no light to pass through
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Created by:
Mackey2002
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