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6.2 Stars and the Universe

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Question 28

A galaxy is at a distance of 45 million light-years from Earth. The galaxy is moving away at a speed of 950 km/s.

One light-year is about 9.46 × 1012 km.

There are about 3.16 × 107 seconds in one year.

Which expression can be used to estimate the age of the Universe in years?

A

45×106×3.16×107950×9.46×1012\frac{45 \times 10^6 \times 3.16 \times 10^7}{950 \times 9.46 \times 10^{12}}950×9.46×101245×106×3.16×107​

B

45×106×9.46×1012950×3.16×107\frac{45 \times 10^6 \times 9.46 \times 10^{12}}{950 \times 3.16 \times 10^7}950×3.16×10745×106×9.46×1012​

C

950×9.46×101245×106×3.16×1012\frac{950 \times 9.46 \times 10^{12}}{45 \times 10^6 \times 3.16 \times 10^{12}}45×106×3.16×1012950×9.46×1012​

D

950×3.16×10745×106×9.46×1012\frac{950 \times 3.16 \times 10^7}{45 \times 10^6 \times 9.46 \times 10^{12}}45×106×9.46×1012950×3.16×107​

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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