Chapter 5: Stars, Spectra, Luminosity and Cosmology

A-level PhysicsModule 5: Newtonian World & Astrophysics8 topicsHigher

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Module 5: Newtonian World and Astrophysics: Stars, Spectra, Luminosity and Cosmology - Authored Long Answer Questions

Examiner-style long-answer practice with automatic marking, improvement advice and ProofCoach tracking.

4 questions25 marks37.5 min

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6 marksdescribestandardOCR A

For Stars, Spectra, Luminosity and Cosmology, describe how stellar spectra, luminosity and Hubble law applies to galaxy spectrum with redshifted hydrogen lines.

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6 markscalculatehardOCR A

Using galaxy spectrum with redshifted hydrogen lines, calculate a relevant OCR A Stars, Spectra, Luminosity and Cosmology quantity and explain the physical or chemical meaning of the answer. Show equation, substitution, answer and unit.

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7 marksexplainhardOCR A

Stars, Spectra, Luminosity and Cosmology - data from: galaxy spectrum with redshifted hydrogen lines

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Recession speed is proportional to distance (Hubble's law: v = H0d). The gradient gives Hubble's constant H0 about 70 km s-1 Mpc-1, evidence for an expanding universe.

The graph for Stars, Spectra, Luminosity and Cosmology shows data from galaxy spectrum with redshifted hydrogen lines. Explain the pattern using the data and relevant physics principles.

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6 marksevaluatestandardOCR A

In galaxy spectrum with redshifted hydrogen lines, evaluate the experimental method or model assumptions used when applying stellar spectra, luminosity and Hubble law.

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4. Gravitational Fields, Satellites and Potentials

End of Module 5: Newtonian World & Astrophysics

Key learning objectives

Understand the key principles behind Stars, Spectra, Luminosity and Cosmology.
Apply these ideas to exam-style questions.
Recall the essential definitions and key terms.