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15 Cards in this Set

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What is Planck's law used to relate?
Relates the energy of a photon to its frequency or wavelength.
What is absorption?
Light being reflected off of an object.
What is emission?
Light being emitted by a flame or heated bar.
What are the characteristics of a blackbody?
Does not reflect incoming radiation, only absorbs.

Emits radiation, depending on temperature.

Temperature and emitted radiation intensity follow a special relationship.
Are blackbodies always black?
No, they only appear black if their temperature is very low.
What is Stefan-Boltzmann's Law used to relate?
Relates energy output of a blackbody to its temperature.
What is Wein's law used to relate?
Relates peak wavelength output by a blackbody to its temperature.
What is flux?
Flux is a measure of how much 'stuff' crosses a small patch.
What is a blackbody?
A hypothetical object that is a perfect absorber of electromagnetic radiation at all wavelengths.
What is the main characteristic of a Red Shift?
The object is moving away from the observer.
What is the main characteristic of a Blue Shift?
The object is moving towards the absorver.
What is the first principle of light?
Light rays from distant objects are nearly parallel.
What is the second princple of light?
Light reflects off a flat mirror in the same way a basket ball would bounce on the floor.
What is the third principle of light?
Light changes direction when it moves from one media to another (refraction).
Why do different colors bend at different amounts?
Chromatic abberation.