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20 Cards in this Set
- Front
- Back
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Lyman Series
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(1) emits ultraviolet photon
(2) electron jumps to lowest order |
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Balmer Series
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(1) emits optical photon
(2) electron jumps to second order |
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Blackbody of 7500K peaks at what type of wavelength?
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ultraviolet
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Blackbody of 6000K peaks at what type of wavelength?
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Visible
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Blackbody of 4500K peaks at what type of wavelength?
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Visible
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How do you calculate your weight on another planet?
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Your weight = [(your mass)(planet's mass)]/(radius of planet)^2
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To reach degrees Kelvin from Celsius, you add what?
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about 273
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How many light-years are in one parsec?
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3.26
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Largest refractive telescope
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Yerkes, 1 meter lens
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Hubble's mirror
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2.4 meters
Cassegrain |
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Hubble's Law
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Velocity of a galaxy = (Hubble’s Constant) x Distance of galaxy
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Cephei variable stars
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(1) Used to determine the distance of galaxies
(2) The longer the period of variation, the greater the absolute magnitude |
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Messier objects were mostly what types of cosmic objects?
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(1) Star clusters
(2) Galaxies |
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Pulsars usually emit what type of light?
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Radio, but can be visual
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White dwarfs are held together by what kind of pressure?
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electron degeneracy pressure
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Neutron stars are held together by what kind of pressure?
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degenerate neutron pressure
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What is usually at the center of a planetary nebula?
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White dwarf
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Spectral Types and lifetimes in main sequence
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O - a few millions
B- tens of millions A - hundreds of millions F - a few billion G - 10 billion M - thousands of billions |
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When parallax angle is equal to one arc-second, how far way is the star?
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1 parsec
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Schwarzschild radius
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the distance from the singularity at which the escape velocity is the speed of light - defines the event horizon
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