The Physics of Astrophysics (Option E) Part 3

20 Questions on the final topic 10.8 of HL Astrophysics (Option E) Covering cosmology, requires knowledge of newton's model of the universe, Olbers paradox and the descriptions and explanations of why we believe what we do about the history and fate of the universe.


1. Newton's model of the universe made four assumptions which were that the universe is...?

  • Infinitely large, Infinitely old, Static and created by god
  • Infinitely large, Infinitely old, Static and Uniform
  • Continually expanding, Finite age, of a finite size and of a finite energy
  • Infinitely massive, finitely old, of degenerate energy and uniform
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2. Olbers' Paradox disproved Newton's model by claiming that in such a universe...?

  • Due to the absorption and re-emission of electromagnetic radiation, the intensity of light incident on earth would also be infinite
  • In order for the universe to be perpetually static, matter could not have momentum, this is not observed
  • In such a static universe, light from other stars would not be shifted by the Doppler effect
  • The gravitational force felt by all matter would be infinite, causing all matter to vaporize into nucleons

3. The different extent of red shifts of distant galaxies implies that the universe is...?

  • Static
  • Contracting
  • Expanding
  • Decreasing in Entropy

4. The reason galaxies move apart is because of...?

  • The force of the big bang which caused the galaxies to move away at a velocity related to their size.
  • Their relatively different speeds
  • The expansion of space between them
  • Their relatively different velocities

5. The relationship between a galaxies distance (Mpc) from earth and it's recessional velocity (km/s)...?

  • Inversely proportional
  • Directly proportional
  • Linearly related
  • Non-linearly related


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