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6.2.3a Galaxies and the scale of the Universe

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Question 19

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

6.2.3a 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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