Cosmology

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  • Created by: syaqub18
  • Created on: 23-05-15 12:20
what is the doppler effect?
when an object is moving away, the wavelength appears to be increasing in frequency and decreasing in wavelength, when moving away, decrease in frequency increase in wavelength
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when does the doppler effect work?
when the objects radial speed is much less than the speed of light
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How can you use absorption spectra to find out whether an object is red shifted or blue shifted?
the object will have the same absorption pattern but shifted towards the red or towards the blue
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what are spectroscopic binary stars?
two stars in mutual orbit around each other
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how can the doppler shift be used to find out whether stars are in a binary system?
one will move towards the star and one will move away, this will produce blue and red shift
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what does hubbles law state?
that the speed of recession of the galaxy is proportional to the distance to the galaxy
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what does hubbles law tell us?
that distant galaxies are receding from us, and that the further away they are, the quicker they are travelling, the universe is expanding
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what is the age of the universe given by?
T =1/H where H is the hubbles constant
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what idea does hubbles law support?
the big bang theory
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what does it mean by cosmological red shift?
that the galaxies themselves aren't actually moving but space itself is expanding
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what is the big bang theory?
that the universe started off at a very hot and infinitely dense point and has been expanding ever since
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what evidence is there for the big bang theory?
1. comic microwave background radiation 2. abundance of H to He 3. red shift of galaxies
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what is a quasar?
oldest and most distant objects in the universe due to its red shift
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what are the characteristics of a quasar?
very powerful light output more than most of the big stars, not much bigger than a star, very large redshift
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How can Comic microwave background radiation be used to prove the big bang theory?
big bang theory predicts there was a lot of EM radiation and that it should still be observed as it hasn't gone anywhere, has been found to correspond to a temp of 2.7K, time has stretched out the wavelength so in microwave region
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how can the relative abundance of H to He be used to prove the big bang theory?
the early universe had been very hot, at one point it must have been hot enough for hydrogen fusion,
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what is dark energy?
energy which fills whole of space
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what might dark energy be used to prove?
that the universe is accelerating not decelerating
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Other cards in this set

Card 2

Front

when does the doppler effect work?

Back

when the objects radial speed is much less than the speed of light

Card 3

Front

How can you use absorption spectra to find out whether an object is red shifted or blue shifted?

Back

Preview of the front of card 3

Card 4

Front

what are spectroscopic binary stars?

Back

Preview of the front of card 4

Card 5

Front

how can the doppler shift be used to find out whether stars are in a binary system?

Back

Preview of the front of card 5
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