A radiation-cooled instrument absorbs radiation at an average power of 150 W. Its emitted power is measured at different temperatures.
| Temperature of instrument (K) | Emitted power (W) |
|---|---|
| 330 | 150 |
| 360 | 210 |
An engineer claims that the instrument can stay at a constant temperature of 330 K.
Use the data to explain whether the engineer is correct.
The instrument is at 330 K when the power it absorbs rises to 170 W. The absorbed power then stays at this value.
Explain how the instrument's temperature changes, and use the data to deduce limits for its new 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.