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15 Cards in this Set
- Front
- Back
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What is Planck's law used to relate?
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Relates the energy of a photon to its frequency or wavelength.
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What is absorption?
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Light being reflected off of an object.
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What is emission?
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Light being emitted by a flame or heated bar.
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What are the characteristics of a blackbody?
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Does not reflect incoming radiation, only absorbs.
Emits radiation, depending on temperature. Temperature and emitted radiation intensity follow a special relationship. |
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Are blackbodies always black?
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No, they only appear black if their temperature is very low.
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What is Stefan-Boltzmann's Law used to relate?
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Relates energy output of a blackbody to its temperature.
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What is Wein's law used to relate?
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Relates peak wavelength output by a blackbody to its temperature.
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What is flux?
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Flux is a measure of how much 'stuff' crosses a small patch.
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What is a blackbody?
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A hypothetical object that is a perfect absorber of electromagnetic radiation at all wavelengths.
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What is the main characteristic of a Red Shift?
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The object is moving away from the observer.
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What is the main characteristic of a Blue Shift?
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The object is moving towards the absorver.
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What is the first principle of light?
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Light rays from distant objects are nearly parallel.
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What is the second princple of light?
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Light reflects off a flat mirror in the same way a basket ball would bounce on the floor.
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What is the third principle of light?
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Light changes direction when it moves from one media to another (refraction).
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Why do different colors bend at different amounts?
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Chromatic abberation.
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