Practise

Question bank

Original exam-style questions, mapped to your syllabus. Answers are checked for mathematical equivalence and every attempt updates your mastery.

TopicSkillDifficulty

12 questions

SA-9702-AS3-0041 markL1 FoundationCalculatorRedshift

Redshift of light from a galaxy shows that the galaxy is

Salam Academy Original Practice · Proposed mark scheme

SA-9702-AS3-0051 markL1 FoundationCalculatorHubble's law

Hubble's law states that the recession speed of a galaxy is

Salam Academy Original Practice · Proposed mark scheme

SA-9702-AS3-0061 markL1 FoundationCalculatorRedshift

A galaxy has

\dfrac{\Delta\lambda}\lambda=0.050

. Calculate its recession speed, in units of

10^7

m s⁻¹.

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SA-9702-AS3-0091 markL1 FoundationCalculatorHubble's law

The SI unit of the Hubble constant is

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SA-9702-AS3-0101 markL1 FoundationCalculatorHubble's law

Galaxy B is three times as far away as galaxy A. State the ratio of their recession speeds (B : A).

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SA-9702-AS3-0121 markL1 FoundationCalculatorRedshift

In redshift, the observed wavelengths of spectral lines are

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SA-9702-AS3-0012 marksL2 StandardCalculatorRedshift

A hydrogen line with laboratory wavelength

656.3

nm is observed at

669.4

nm in a galaxy's spectrum. Calculate the galaxy's recession speed, in units of

10^6

m s⁻¹.

Salam Academy Original Practice · Proposed mark scheme

SA-9702-AS3-0021 markL2 StandardCalculatorHubble's law

A galaxy recedes at

6.0\times10^6

m s⁻¹. Using

H_0=2.3\times10^{-18}

s⁻¹, calculate its distance, in units of

10^{24}

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SA-9702-AS3-0032 marksL2 StandardCalculatorHubble's law

Estimate the age of the universe from

H_0=2.3\times10^{-18}

s⁻¹, in billions of years. (

1

year

=3.16\times10^7

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SA-9702-AS3-0071 markL2 StandardCalculatorHubble's law

Hubble's law supports the Big Bang theory because it shows that

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SA-9702-AS3-0081 markL2 StandardCalculatorRedshift

A galaxy recedes at

9.0\times10^6

m s⁻¹. A spectral line has laboratory wavelength

500.0

nm. Calculate its observed wavelength, in nm.

Salam Academy Original Practice · Proposed mark scheme

SA-9702-AS3-0113 marksL3 ExamCalculatorHubble's law

A type Ia supernova in a galaxy shows a galaxy distance of

1.3\times10^{25}

m. A calcium line (

\lambda=393.4

nm) in the galaxy's spectrum is observed at

432.7

nm. Calculate the Hubble constant implied, in units of

10^{-18}

s⁻¹.

Salam Academy Original Practice · Proposed mark scheme