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Cosmology (A-level only)

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Question 1

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

GalaxyRedshift, zzzDistance from Earth / Mpc\text{Mpc}Mpc
NGC 43213.4×10−33.4 \times 10^{-3}3.4×10−314.814.814.8
NGC 44147.1×10−37.1 \times 10^{-3}7.1×10−331.531.531.5
1.

Evaluate whether these observational measurements are consistent with Hubble’s Law.

[3]
2.

Quasars are extremely distant active galactic nuclei. Discuss one difficulty in using standard candles, such as Type Ia supernovae, to determine the distance from Earth to a very distant host galaxy of a quasar.

[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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