CAIE IGCSE Physics: Age of the Universe from H₀ Question Bank

Practise using 1/H0 or d/v to estimate the age of the Universe and explaining how recession data supports expansion.

Exam points

use age = 1/H0 or d/v to calculate the age of the Universe in seconds or years
explain that more distant galaxies receding faster suggests the Universe is expanding
link present recession to the idea that galaxies were closer together in the past

[Maximum number: 2]

The Milky Way is the galaxy in which the Solar System is located.

Astronomers determine the speed and distance from the Earth of a far galaxy that is moving away from the Earth.

The best estimate for the Hubble constant $H_{0}$ is $2.2 \times 10^{-18}$ per second.

Use this value to calculate an estimate for the age of the Universe.
> age of the Universe = s [2]
[Total: 8]

$4.5 \times 10^{17}(\mathrm{~s})$

A2

(age of Universe =) $1 / H_{0}$ OR $1 /\left(2.2 \times 10^{-18}\right)$

C1

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6.2.3.11—D/v = 1/H0 estimates the age of the question 1