An engineering laboratory compares a matt black sleeve and a shiny sleeve for metal pipes exposed to infrared radiation. In the first trials, each sleeve is fitted to a separate identical pipe section at a different position on the bench. Which change to the method would best test whether any difference in temperature rise is caused by surface finish rather than position?
Move both pipe sections nearer the infrared source while keeping the sleeves at two different positions.
Repeat each sleeve on its original pipe section at its original position, then calculate the mean temperature rise.
Use temperature probes with smaller scale divisions while keeping each sleeve in its original position.
Fit each sleeve in turn to the same pipe section at one fixed position, using the same starting temperature and heating time.
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.