Mass Chandrasekhar limit 1 Expanding gasplanetary nebularred giant 1

Mass chandrasekhar limit 1 expanding gasplanetary

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Mass > Chandrasekhar limit (1) Expanding gas/planetary nebular/red giant (1) Gravitational collapse /ref. to burning He or higher metals (1) Correct ref. to (Fermi) pressure / radiation pressure (1) (must have ref. to pressure or force from radiation.) Neutron star (neutron by itself, not enough) (1) Correct reference to Schwarzschild radius/ allow mass> 3M/ allow ref. critical radius (1) Black Hole (1) 6 [6] 23. Any 5 from Uniform intensity in all directions/ everywhere (1) Structure in background intensity/ripples (1) Produced when matter and radiation decoupled (1) Originally gamma radiation (1) (gamma) red-shifted to microwave/originally higher energy (1) Evidence that universe began with big bang. (1) Temperature corresponds to 2.7K / 3K / that predicted by big bang model (1) 5 [5] 24. Any 2 from No experimental evidence/ no physical evidence (1) State of matter unknown/ laws of physics unknown (1) Energies unreproducible/ ref. to very high temperature (1) 2 [2] 6
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25. Open: Universe expands for all time (1) Flat: expands to a limit (but never reaches it) (1) Closed: Universe contracts/ collapses back (1) reference to role of gravity/ critical density (1) Marks for a. can be gained on labelled diagram. 4 [4] 26. H o 2 = 1 × 10 –26 × 8 × π × 6.67 × 10 –11 / 3 (1) H o = 2.36 × 10 –18 s –1 (1) 2 [2] 7
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  • Spring '18
  • fatima
  • Big Bang, Cosmic microwave background radiation, Ambrose College

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