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6.2.3a Galaxies and the scale of the Universe

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Question 7

A galaxy is at a distance of 80 million light-years from the Earth. The galaxy is moving away at a speed of 1600 km/s.

One light-year is about 9.5 × 1012 km.

There are about 3.2 × 107 seconds in one year.

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

A

80×106×3.2×1071600×9.5×1012\frac{80 \times 10^6 \times 3.2 \times 10^7}{1600 \times 9.5 \times 10^{12}}1600×9.5×101280×106×3.2×107​

B

80×106×9.5×10121600×3.2×107\frac{80 \times 10^6 \times 9.5 \times 10^{12}}{1600 \times 3.2 \times 10^7}1600×3.2×10780×106×9.5×1012​

C

1600×9.5×101280×106×3.2×107\frac{1600 \times 9.5 \times 10^{12}}{80 \times 10^6 \times 3.2 \times 10^7}80×106×3.2×1071600×9.5×1012​

D

1600×3.2×10780×106×9.5×1012\frac{1600 \times 3.2 \times 10^7}{80 \times 10^6 \times 9.5 \times 10^{12}}80×106×9.5×10121600×3.2×107​

Markscheme

6.2.3a Galaxies and the scale of the Universe Questions

  1. IGCSE
  2. /Physics
  3. /6.2.3a Galaxies and the scale of the Universe

59 exam-style questions on CIE IGCSE Physics 6.2.3a Galaxies and the scale of the Universe. Each one has a worked solution and a mark scheme showing where the marks go.

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