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14.1 Density and states of matter

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Question 6

A massive star has evolved to become a white dwarf.

The mass, MMM, of the white dwarf, of radius RRR, is given by global volumetric mass density relation:

M=4×π×D×R33 M = \frac{4 \times \pi \times D \times R^3}{3} M=34×π×D×R3​

where:

  • M=2.4×1030 kgM = 2.4 \times 10^{30} \text{ kg}M=2.4×1030 kg
  • D=2.0×109 kg/m3D = 2.0 \times 10^{9} \text{ kg/m}^3D=2.0×109 kg/m3 (the average density of the white dwarf)

Calculate the radius, RRR, of this white dwarf. Give your answer to 2 significant figures.

[2]
Markscheme

14.1 Density and states of matter Questions

  1. GCSE
  2. /Physics
  3. /14.1 Density and states of matter

55 exam-style questions on Edexcel GCSE Physics 14.1 Density and states of matter, covering 14.1.1 Kinetic theory and states of matter, 14.1.2 Density, and 14.1.3 Density and changes of state. Each one has a worked solution and a mark scheme showing where the marks go.

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