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41 Cards in this Set
- Front
- Back
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Which of the following types of spectra would be more common for a very bright hot object?
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Continuous spectra
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A light-year is a unit of _____________.
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distance
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A refracting telescope uses _________ to funnel light to the eyepiece.
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lenses
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Which part of the sun would you expect to have the highest temperatures?
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core
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Why is our Sun brighter than other stars?
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it is closer than other stars
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Which of the following is NOT a way that light and matter interact?
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Radiation
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The electromagnetic spectrum does NOT include ___________.
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Sigma waves
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Which of the following is the visible surface of the sun?
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Photosphere
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What does it mean for a star to be "main sequence"?
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It is converting hydrogen to helium in the core of the star
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What element cannot be produced in a low mass star?
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Silicon
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What is a brown dwarf?
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A protostar that never began fusion
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What step precedes the onset of hydrogen fusion in a star?
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The formation of jets
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What is the main sequence lifetime of a low mass star?
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10 billion years
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How do low-mass stars convert Hydrogen to Helium?
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Proton-Proton Chain
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What type of star would have the lowest surface temperature?
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k
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What is the main sequence lifetime of a high mass star?
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5 million years
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Why are high mass stars more short lived than low mass stars?
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They use the CNO cycle
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Which of the following information about a star can be found on an H-R diagram?
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luminosity
spectral type temperature |
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what property does an objects thermal radiation spectrum depend on?
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temperature
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doppler effect
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determining motion from light: waves distorted because object in motion
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redshift
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longer wavelengths of visible light object is moving away from you
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blueshift
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shorter wavelengths of visible light object is moving towards you
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reflecting telescopes
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mirrors
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why do we put telescopes in space?
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1)light pollution
2)turbulence causes twinkling blurs images 3)our atmosphere absorbs most of electromatic spectrum |
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why does the shine?
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because it's powered by fusion
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gravitational equilibruim
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energy provided by fusion maintains the outwards pressure that stops the star from collapsing in on itself
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solar wind
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flow of charge particles from surface of sun
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photosphere
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visible surface of sun
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core
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energy generated by nuclear fusion
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what ways does light interact with matter?
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-emission(object emits light)
-absorption(light get absorbed) -transmission(light moves through matter) -reflection/scattering(what we see) |
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why is the sky blue?
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gases in our atmosphere scatter light with shorter wavelengths(blue) most effectively
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why are sunsets red?
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at sunset or sunrise, the sunlight travels longer which scatters away most of the blue light leaving only red light.
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spectrum
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the light from an object as it appears when we pass it through a prisim
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continious spectrum
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the spectrum of a very bright hot object spans all visible wavelenghts without interruption
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emission line spectrum
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cooler objects emit light at only specific wavelenghts and most of the spectrum is missing
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absorption line spectrum
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most complete spectra must pass through an object that absorbs some wavelenghts
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how do we classify the stars?
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luminosity
temperature mass(most important) |
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luminosity
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amount of power a star radiates
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apparent brightness
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amount of starlight that reaches earth
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what does the relationship between apparent brightness and luminosity depend on?
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distance
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what are the spectral types? (from hottest to coolest)
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O(blue)
B(light blue) A(white) F(white) G(yellow) K(orange) M(red) |
