A student heats water using a constant-power heater. The temperature-time graph becomes less steep as the water warms, well below its boiling point. The mass and specific heat capacity remain constant. Which statement explains this change?
Energy loss decreases, so more energy per second warms the water.
Energy loss increases, so less energy per second warms the water.
Energy loss decreases, so less energy per second warms the water.
Energy loss increases, so more energy per second warms the water.
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.