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6.2 Stars and the Universe

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Question 7

A galaxy at a distance of 1.8 × 1021 km is moving away from the Earth with a speed of 4500 km s-1.

What is the Hubble constant H0 H_0\,H0​ calculated using this data and what is the speed of a galaxy at a distance of 5.4 × 1021 km from the Earth?

A

H0=2.5×10−18 s−1H_0 = 2.5 \times 10^{-18}\text{ s}^{-1}H0​=2.5×10−18 s−1, speed =13500 km s−1= 13500\text{ km s}^{-1}=13500 km s−1

B

H0=2.5×10−18 s−1H_0 = 2.5 \times 10^{-18}\text{ s}^{-1}H0​=2.5×10−18 s−1, speed =1500 km s−1= 1500\text{ km s}^{-1}=1500 km s−1

C

H0=4.0×1017 s−1H_0 = 4.0 \times 10^{17}\text{ s}^{-1}H0​=4.0×1017 s−1, speed =13500 km s−1= 13500\text{ km s}^{-1}=13500 km s−1

D

H0=4.0×1017 s−1H_0 = 4.0 \times 10^{17}\text{ s}^{-1}H0​=4.0×1017 s−1, speed =1500 km s−1= 1500\text{ km s}^{-1}=1500 km s−1

Markscheme

6.2 Stars and the Universe Questions

  1. IGCSE
  2. /Physics
  3. /6.2 Stars and the Universe

104 exam-style questions on CIE IGCSE Physics 6.2 Stars and the Universe, covering 6.2.1 The Sun as a star, 6.2.2a Galaxies and astronomical distances, 6.2.2b The life cycle of a star, 6.2.3a Galaxies and the scale of the Universe, 6.2.3b Redshift, 6.2.3c The Big Bang Theory and cosmic microwave background radiation, and 6.2.3d The Hubble constant and the age of the Universe. Each one has a worked solution and a mark scheme showing where the marks go.

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