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-AS1-0031 markL1 FoundationCalculatorRadiant flux

The luminosity of a star is

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SA-9702-AS1-0041 markL1 FoundationCalculatorStandard candles

A standard candle is

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SA-9702-AS1-0051 markL1 FoundationCalculatorRadiant flux

A star is moved to three times its distance. State the factor by which its radiant flux at Earth changes, as a decimal.

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SA-9702-AS1-0071 markL1 FoundationCalculatorStandard candles

Which is used as a standard candle to measure distances to very distant galaxies?

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SA-9702-AS1-0091 markL1 FoundationCalculatorStandard candles

The luminosity of a Cepheid variable star can be found from

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SA-9702-AS1-0121 markL1 FoundationCalculatorRadiant flux

Radiant flux intensity is measured in

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SA-9702-AS1-0012 marksL2 StandardCalculatorRadiant flux

The Sun has luminosity

3.83\times10^{26}

W and is

1.50\times10^{11}

m from Earth. Calculate the radiant flux intensity at Earth, in W m⁻².

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SA-9702-AS1-0022 marksL2 StandardCalculatorStandard candles

A Cepheid of luminosity

1.0\times10^{30}

W gives a radiant flux of

2.0\times10^{-12}

W m⁻² at Earth. Calculate its distance, in units of

10^{20}

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SA-9702-AS1-0061 markL2 StandardCalculatorStandard candles

Two identical Cepheids are observed. One gives

100

times the radiant flux of the other. Calculate how many times further away the fainter one is.

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SA-9702-AS1-0082 marksL2 StandardCalculatorRadiant flux

A star at a distance of

4.0\times10^{17}

m gives a radiant flux of

5.0\times10^{-9}

W m⁻². Calculate its luminosity, in units of

10^{28}

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SA-9702-AS1-0101 markL2 StandardCalculatorRadiant flux

Convert a distance of

2.0\times10^{20}

m into light-years, in units of

10^4

ly. (

1

=9.46\times10^{15}

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SA-9702-AS1-0113 marksL3 ExamCalculatorStandard candles

A type Ia supernova reaches a peak luminosity of

1.0\times10^{36}

W. At Earth, its peak flux is

8.0\times10^{-15}

W m⁻². Calculate its distance, in millions of light-years. (

1

=9.46\times10^{15}

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