A student used an infrared detector to compare two faces of a hollow metal cube filled with hot water. The student took three readings for each face, moving the detector away and setting it up again between readings.
Table: Three infrared detector readings for each of two faces of a hollow metal cube filled with hot water
| Surface of the face | Reading 1 in arbitrary units | Reading 2 in arbitrary units | Reading 3 in arbitrary units |
|---|---|---|---|
| matt black | 91 | 94 | 92 |
| shiny silver | 19 | 17 | 18 |
Calculate the mean detector reading for the matt black face. Give your answer to three significant figures.
Give the range of the three readings for the matt black face.
The mean reading for the shiny silver face is 18.0 arbitrary units. Explain what the two mean readings show about the two surfaces.
40 exam-style questions on AQA GCSE Physics 6.3 Black body radiation, covering 6.3.1 Emission and absorption of infrared radiation and 6.3.2 Perfect black bodies and radiation. Each one has a worked solution and a mark scheme showing where the marks go.