Identical beakers contain equal masses of water initially at 80 ∘C80\ ^\circ\mathrm{C}80 ∘C. The table shows their temperatures after 10 min in the same room.
| Insulation | Final temperature in ∘C^\circ\mathrm{C}∘C |
|---|---|
| None | 48 |
| P | 62 |
| Q | 68 |
| R | 59 |
Which insulation is most effective, and how much smaller is its temperature decrease than that of the uninsulated beaker?
Q; 12 ∘C12\ ^\circ\mathrm{C}12 ∘C
R; 21 ∘C21\ ^\circ\mathrm{C}21 ∘C
P; 14 ∘C14\ ^\circ\mathrm{C}14 ∘C
Q; 20 ∘C20\ ^\circ\mathrm{C}20 ∘C
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.