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16 Cards in this Set
- Front
- Back
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What is Incandescence and examples |
Emits light because of high temperatures Kerosene lamp, Light bulb |
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What is Phosphorescence and examples |
Emits light for a short time after exposed to another energy source Glow in the dark objects |
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What is electric discharge and examples |
Emits light when electricity passes through a gas Lightning, Neon tube lights |
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What is Fluorescence and examples |
Emits light while receiving energy from a source Fluorescent tube lights |
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What is Chemiluminescence and examples |
When Chemical energy turns into light energy with little to no change in temperature Glow stick/Lightstick |
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What is bioluminescence and examples |
When living things transform chemical energy into light energy Fireflies, Glow-worms |
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What is a shadow |
An area where light is covered by an object |
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What is an Umbra |
An area where no light reaches |
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What is a Penumbra |
An area where some light reaches |
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Properties of light (6) |
-Travels in straight paths -Travels at a constant speed of 300m m/s -Travels as an EMR and particle -reflects -Refracts when passing through materials -Can absorb into materials |
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Types of EMR |
Radio waves, Microwaves, infrared, Visible light, Ultraviolet, X-rays, Gamma rays |
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What is transparency |
Measure of how much light passes through an material |
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What does Transparent mean and examples |
Lets light pass through easily Plate glass, Air, shallow/clear water |
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What does Translucent mean |
Transmits and reflects light, clear image cannot be seen through Frosted glass, Clouds, fingernails, skin |
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What does Opaque mean |
No light can pass through. Light energy is either absorbed or reflected Wood, Stone, Brick |
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Why do we see color |
We see color because when white light hits an opaque object, it is either reflected or absorbed. when it is absorbed, we don't see color. When it is reflected, we see color. For example, if an object is blue, that means that blue is being reflected while the other spectral colors are being absorbed. |
