Astronomers use a computer model of a star to study two changes in its core. At first, the rate of nuclear fusion in the core decreases. Later, the rate of nuclear fusion in the core increases.
Explain how the star responds to each change in the rate of fusion.
75 exam-style questions on Edexcel GCSE Physics 7.3 Stars, covering 7.3.1 Evolution of stars similar to the Sun, 7.3.2 Evolution of massive stars, and 7.3.3 Observing the Universe. Each one has a worked solution and a mark scheme showing where the marks go.