What this topic covers

Astronomy and cosmology is topic 25 of the Cambridge 9702 syllabus (2025–2027), covering standard candles, stellar radii, and Hubble's law and the Big Bang theory. It is A Level content, examined in Paper 4 (A Level Structured Questions), which carries 38.5% of the A Level. Students commonly find it difficult to distinguish luminosity from radiant flux intensity, to apply the inverse-square relationship in determining distances using standard candles, and to combine Wien's displacement law with the Stefan–Boltzmann law to estimate stellar radii. Interpreting redshift and using Hubble's law as evidence for an expanding universe require careful explanation as well as calculation. Although the final topic in the syllabus, it is examined with the same precision as the rest of Paper 4.

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Questions in this topic

• 9702/41/O/N/24 Q10 — redshift and universe expansion · 10 marks
• 9702/43/O/N/24 Q10 — redshift and universe expansion · 10 marks
• 9702/42/M/J/24 Q8 — emission spectrum and Hubble's law · 12 marks
• 9702/43/M/J/24 Q10 — luminosity and standard candles · 9 marks
• 9702/41/O/N/23 Q3 — ideal gas and star properties · 13 marks
• 9702/42/O/N/23 Q10 — Wien's displacement law and redshift · 8 marks
• 9702/43/O/N/23 Q3 — ideal gases and kinetic theory · 13 marks
• 9702/41/M/J/23 Q10 — Hubble's law and Doppler effect · 9 marks
• 9702/42/M/J/23 Q9 — mass defect and fusion · 11 marks
• 9702/43/M/J/23 Q10 — Hubble's law and Doppler effect · 9 marks
• 9702/42/F/M/23 Q10 — astronomy and cosmology · 9 marks
• 9702/41/O/N/22 Q9 — stellar luminosity · 8 marks
• 9702/42/O/N/22 Q9 — hydrogen emission spectrum · 13 marks
• 9702/43/O/N/22 Q9 — stellar luminosity · 8 marks
• 9702/41/M/J/22 Q10 — Wien's law and redshift · 9 marks
• 9702/42/M/J/22 Q9 — Hubble's law and expanding Universe · 7 marks
• 9702/43/M/J/22 Q10 — Wien's law and redshift · 9 marks
• 9702/42/F/M/22 Q12 — luminosity and temperature of stars · 7 marks
• 9702/42/O/N/18 Q5 — radio communication and geostationary satellites · 11 marks
• 9702/41/M/J/18 Q5 — geostationary satellite communication · 8 marks
• 9702/43/M/J/18 Q5 — geostationary satellite communication · 8 marks

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