The table shows data for four galaxies.
Table
| Galaxy | Distance from Earth (million light-years) | Speed moving away from Earth (km/s) |
|---|---|---|
| P | 50 | 1100 |
| Q | 120 | 2600 |
| R | 200 | 4400 |
| S | 310 | 6800 |
Which statement about the data is correct?
The speed decreases with distance, which suggests the universe is expanding
The speed increases with distance, which suggests the universe is expanding
The speed increases with distance, which suggests the universe is contracting
The speed is the same at every distance, which suggests the universe is not changing
50 exam-style questions on OCR GCSE Physics 8.3 Beyond Earth, covering 8.3.1 Red-shift and the expanding universe, 8.3.2 Evidence for the Big Bang model, 8.3.3 Formation of the Sun and stellar equilibrium, 8.3.4 Radiation emitted by hot bodies, 8.3.5 The solar system and satellites, 8.3.6 Gravity and circular orbits, 8.3.7 Orbital radius and orbital speed, 8.3.8 Radiation balance and the temperature of the Earth, and 8.3.9 Seismic waves and exploring hidden structures. Each one has a worked solution and a mark scheme showing where the marks go.