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Cambridge IGCSE Physics practice

Paper 3 structured question: The Universe

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The Universe

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Paper 3Theory (Core)1 marks

The redshift observed in light from distant galaxies is a critical observation in astrophysics.

Description

Redshift and Galaxy Movement

Astronomers have observed that light from galaxies shows a redshift, indicating they are moving away from Earth. This phenomenon is used to understand the expansion of the universe.

  1. a

    State What does redshift indicate about the movement of galaxies?

    Aim for approximately 1 distinct marking point.

    [1]

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Paper 3 structured question: The Universe

Paper 3Theory (Core)3 marks

Description

Understanding Redshift

Redshift occurs when the wavelength of light increases as the source moves away from the observer. This effect is crucial for measuring the speed of galaxies and understanding cosmic expansion.

  1. a

    Describe How does redshift provide evidence for the expanding universe?

    Aim for approximately 3 distinct marking points.

    [3]