Eduqas A Level Physics
Eduqas A Level Physics 2.8 Orbits and the Wider Universe Exam Questions
Free Eduqas A Level Physics exam questions on 2.8 Orbits and the Wider Universe, with mark schemes. Covers Kepler's laws, orbital motion, dark matter, Doppler shift and the Hubble constant.
2.8 Orbits and the Wider Universe exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
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A Level Physics Flashcards
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About Eduqas A Level Physics 2.8 Orbits and the Wider Universe
This topic applies gravity to space.
What you need to know
- Kepler's laws Elliptical orbits, equal areas and T² ∝ r³.
- Orbital speed v = √(GM/r).
- Dark matter Evidence from galaxy rotation curves.
- Doppler and Hubble Δλ/λ = v/c, v = H₀D and the age of the universe.
Common mistakes in 2.8 Orbits and the Wider Universe
- Forgetting r is from the centre.
- Mixing redshift and blueshift.
- Using Hubble units inconsistently.
Try three 2.8 Orbits and the Wider Universe exam-style questions
1. Derive T² ∝ r³ for a circular orbit. (2 marks)
Show the mark scheme answer
GMm/r² = m(2πr/T)²/r (1); T² = 4π²r³/GM (1).
2. Explain what galaxy rotation curves suggest. (2 marks)
Show the mark scheme answer
Outer stars move faster than visible mass predicts (1), suggesting unseen dark matter (1).
3. State what redshift indicates. (1 mark)
Show the mark scheme answer
The source is moving away.
2.8 Orbits and the Wider Universe FAQs
What does this topic cover?
Orbits, Kepler's laws, dark matter and Hubble's law.
How is the age of the universe estimated?
About 1/H₀.
How are exoplanets detected?
By the Doppler wobble of the host star.
Revise this topic with flashcards: A Level Physics Flashcards, with mark scheme answers for Anki and Quizlet.
