Physics · Pearson Edexcel 9PH0 · Topic 10

Space

Radiation from stars, measuring astronomical distances, the life cycles of stars and the expanding universe.

  • 8 sub-topics
  • Taught in Year 13
  • 58 practice questions
  • 8 animated lessons
Practice questions (58) Lessons Worksheets All Edexcel Physics topics

What the specification says

Every sub-topic Pearson Edexcel can examine in this topic, with its reference number from the official specification. The Y12 and Y13 tags show when each sub-topic is usually taught.

  1. 156Intensity and luminosityY13
  2. 157Trigonometric parallaxY13
  3. 158Standard candlesY13
  4. 159Hertzsprung–Russell diagramY13
  5. 160Life cycles of starsY13
  6. 161Doppler effectY13
  7. 162Redshift and Hubble's law, v = H₀dY13
  8. 163The age and fate of the universe and dark matterY13

Try 3 questions

Easy, medium and hard questions from this topic, each with a worked solutions and the mark for every step. All 58 questions in this topic, free, no account needed.

Space

Not needed for Year 12Easy

Axes of the HR diagram · Year 13 · 1 mark

  1. How does the surface temperature scale run on a Hertzsprung–Russell diagram?
    (1)

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  1. The temperature axis is drawn backwards, and brightness increases upwards.A: From hot on the left to cool on the right

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Space

Not needed for Year 12Medium

Intensity and luminosity · Year 13 · 3 marks

A star of luminosity 2.0×10252.0 \times 10^{25} W is 10 light years from Earth.
  1. Calculate the intensity of its radiation at Earth.
    (3)

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  1. dd=9.46×1016 m{}= 9.46 \times 10^{16}\ \mathrm{m}
  2. I=L4πd2I = \frac{L}{4\pi d^2}
  3. II=1.78×10−10 W m−2{}= 1.78 \times 10^{-10}\ \mathrm{W\,m^{-2}}

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Space

Not needed for Year 12Hard

Age of the universe · Year 13 · 2 marks

H₀ = 70 km s⁻¹ Mpc⁻¹.
  1. Estimate the age of the universe in years.
    (2)

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  1. H0H_0=2.27×10−18 s−1{}= 2.27 \times 10^{-18}\ \mathrm{s^{-1}}
  2. tt=1.40×1010 years{}= 1.40 \times 10^{10}\ \mathrm{years}

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