A student uses a warm-water bath to produce a temperature–time graph while crushed ice melts in a boiling tube. The student must choose where to hold the temperature probe.
Which probe position should the student use, and why?
Hold the probe tip against the inside wall; it responds most quickly to the warm-water bath.
Rest the probe tip on the base of the tube; it records the temperature where melting starts.
Position the probe tip at the top surface; it records the temperature of the last ice to warm.
Place the probe tip centrally in the crushed ice; it records the temperature of the ice rather than the glass.
110 exam-style questions on Edexcel GCSE Physics 14.2 Specific heat capacity and latent heat, covering 14.2.1 Heating, temperature and changes of state, 14.2.2 Specific heat capacity and specific latent heat, 14.2.3 Specific heat capacity calculation, 14.2.4 Specific latent heat calculation, and 14.2.5 Reducing energy transfer through thermal insulation. Each one has a worked solution and a mark scheme showing where the marks go.