Two identical ceramic beads, P and Q, are suspended in a vacuum chamber. They exchange energy with their surroundings only by radiation.
| Bead | Total emitted power in W | Peak wavelength in µm |
|---|---|---|
| P | 4.5 | 5.8 |
| Q | 50 | 3.2 |
State which bead is hotter.
Explain how both measurements support your answer.
Bead Q absorbs radiation at an average power of 38 W.
Explain how the temperature and emitted power of bead Q change until it reaches a constant temperature.
96 exam-style questions on Edexcel GCSE Physics 5.3 Black body radiation, covering 5.3.1 Emission of radiation and temperature, 5.3.2 Radiation balance and constant temperature, and 5.3.3 The temperature of the Earth. Each one has a worked solution and a mark scheme showing where the marks go.