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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)3 marks

Using the Hubble constant to calculate velocity.

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Calculating Galaxy Velocity

If the Hubble constant is 70 km/s/Mpc, calculate the velocity of a galaxy that is 15 megaparsecs away.

  1. a

    Define the Hubble constant and calculate the velocity of the galaxy.

    Aim for approximately 3 distinct marking points.

    [3]

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Paper 4 structured question: The Universe

Paper 4Theory (Extended)1 marks

Description

Understanding the Hubble Constant

The Hubble constant relates the speed of galaxies to their distance from Earth. It is defined by the equation v = H₀d, where v is the velocity of a galaxy, H₀ is the Hubble constant, and d is the distance to the galaxy.

  1. a

    State the definition of the Hubble constant.

    Aim for approximately 1 distinct marking point.

    [1]