The Table shows the surface temperature and colour of four stars.
Table
| Star | Surface temperature in ∘C^\circ\text{C}∘C | Colour |
|---|---|---|
| Betelgeuse | 3300 | red |
| the Sun | 5500 | yellow |
| Sirius | 9700 | white |
| Rigel | 11 80011\ 80011 800 | blue-white |
Which star emits the most intense radiation from each square metre of its surface?
Describe how the colour of a star depends on its surface temperature.
An electric cooker ring gives out no visible light when it is warm. When it is very hot, it glows red.
Explain why.
The surface of the Earth has a mean temperature of about 15 ∘C15\ ^\circ\text{C}15 ∘C.
Name the type of electromagnetic radiation that the Earth's surface mainly emits.
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.