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Cambridge IGCSE Physics practice

Paper 4 structured question: The Universe

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The Universe

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Paper 4Theory (Extended)2 marks

A supernova is used to measure the distance to a galaxy.

Description

Distance Measurement

The apparent brightness of a supernova is measured to be 2.5 x 10^-9 W/m^2. The absolute brightness is known to be 1.0 x 10^-6 W/m^2.

  1. a

    State the distance to the galaxy in meters.

    Aim for approximately 2 distinct marking points.

    [2]

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Paper 4 structured question: The Universe

Paper 4Theory (Extended)1 marks

Description

Supernova Observation

A supernova is observed with an apparent brightness of 1.0 x 10^-9 W/m^2. The absolute brightness of this type of supernova is known to be 1.0 x 10^-6 W/m^2.

  1. a

    State the formula used to calculate the distance to the galaxy.

    Aim for approximately 1 distinct marking point.

    [1]