During heat treatment, a radiation sensor records the radiation emitted from the same area of a steel slab. The sensor is the same distance from the slab for both readings.
| Reading | Total intensity (kW/m²) | Peak wavelength (μm) |
|---|---|---|
| P | 66 | 2.6 |
| Q | 175 | 2.1 |
Explain which reading was recorded when the slab was at the higher temperature.
A technician states that at reading Q the slab emits radiation with a wavelength of 2.1 μm only.
Explain why the technician's statement is incorrect.
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.