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32 Cards in this Set
- Front
- Back
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what type of wave is light?
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e/m
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2 properties of e/m light
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transport energy by propogating. all move at speed of light
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wavelength
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distance from one crest to another
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frequency
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number of cycles in one second
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energy decreases as.....
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square of the distance from source of light
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increasing frequency
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gamma, x- ray, ultraviolet, infrared, microwaves, radio
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visible light area
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700 nm red 400 nm blue
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luminosity
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energy given off
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brightness
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how bright it is
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blackbody
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absorbs all radiation, heats up, direct relationship btwn radiation and temp
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how do stars act like blackbodies?
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direct realtionship between radiation and temp.
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steps of stars blackbody thing.
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collect radiation
make graph intensity vs. wl compare to blackbody |
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spectroscope
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breaks light into consistent wavelengths
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contintous spectrum
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all colors in present continous form
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emission spec.
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lines from only certain wl
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absorbtion
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dark lines in continous spec.
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blue shift
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toward
shorter wl crowd |
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red shift
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away
wl incr. spread |
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refractor
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collects light using lens
bends light waves |
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reflector
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reflects light w/ mirrors focuses by reflection
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objective lens
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collects light from object
makes bright image |
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eyepiece (magnifier)
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mags. image from objective
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prime
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comes to focus after reflection from primary mirror
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Newtonian
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from side after reflection from secondary mirror. off to side.
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cassegrain
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light reflected by seconday mirror throught hole in primary mirror.
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telescope requirements
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gathers light
magnifies good resolution |
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light gather ability depends on
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aperature size-diameter of lens
larger lens=more collection |
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kinds of telescopes that can look at Earth
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optical
infrared radiowaves microwaves |
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asteriods
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rocky things orbiting sun
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comet
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ice an dust orbiting sun
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terrestrial
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earth, mars, mercury, venus, jupiter.
mostly rocky surface |
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Jovian
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jupiter, neptune, saturn, uranus.
not solid, gas/liquid |
