A campsite uses sunlight to warm water in a shower bag. The bag can have either a black outer surface or a white outer surface. Tests use otherwise identical bags containing equal masses of water and receiving sunlight of the same intensity. Both bags start at the same temperature.
Explain which outer surface should be chosen so that the water reaches the required temperature sooner.
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.