AQA•A-Level•Physics
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Astrophysics (Optional)
Telescopes, stellar classification and cosmology
Practice 46 subtopics in Astrophysics (Optional). All questions match the AQA A-Level specification.
About Astrophysics (Optional)
Astrophysics (Optional) is a key topic in the AQA A-Level Physicsspecification. This topic covers telescopes, stellar classification and cosmology.
Master all 46 subtopics below with unlimited AI-generated questions. Each subtopic page includes sample questions and the ability to generate unlimited practice questions with detailed solutions.
All Subtopics (46)
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Random Practice
Practice any subtopic from Astrophysics (Optional)
Astronomical refracting telescopeChromatic aberrationAstronomical reflecting telescopeCassegrain arrangementParabolic mirrorsResolving power: θ ≈ λ/DRayleigh criterionCollecting powerCharge-coupled devices (CCDs)Quantum efficiency of CCDsRadio telescopesSingle dish and arraysInfrared, UV and X-ray telescopesAtmospheric absorptionSpace-based telescopesApparent magnitude mAbsolute magnitude MMagnitude equation: m - M = 5 log(d/10)Luminosity and brightnessInverse square law for intensityStefan-Boltzmann law: L = 4πr²σT⁴Wien's displacement law: λmax T = constantStellar spectraSpectral classes: O B A F G K MTemperature and spectral classHertzsprung-Russell diagramMain sequence starsRed giants and supergiantsWhite dwarfsStellar evolutionSupernovaNeutron starsBlack holes and event horizonSchwarzschild radiusDoppler effect for lightRed shift and blue shiftz = Δλ/λ = v/cHubble's law: v = H₀dHubble constantAge of universe estimateBig Bang theoryCosmic microwave background radiationQuasarsExoplanet detection methodsTransit methodRadial velocity method
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