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Cosmology (A-level only)

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Question 2

The table below contains observational data for two nearby spiral galaxies.

GalaxyRedshift, zzzDistance from Earth / ly\text{ly}ly
NGC 29033.8×10−33.8 \times 10^{-3}3.8×10−35.3×1075.3 \times 10^75.3×107
NGC 33511.8×10−31.8 \times 10^{-3}1.8×10−32.7×1072.7 \times 10^72.7×107
a.

Discuss whether these data are consistent with Hubble’s Law.

[3]
b.

Very distant primordial galaxies are observed at high redshifts. Discuss one difficulty in using standard candles (such as Type Ia supernovae) to determine the distance from the Earth to these extremely distant galaxies.

[2]
Markscheme

Cosmology (A-level only) Questions

  1. A Level
  2. /Physics
  3. /Cosmology (A-level only)

15 exam-style questions on AQA A Level Physics Cosmology (A-level only), covering Doppler effect (A-level only), Hubble's law (A-level only), Quasars (A-level only), and Detection of exoplanets (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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