The Sun is a stable main-sequence star. Which statement correctly describes the primary nuclear reaction taking place in its core to release energy?
Nuclear fusion, where hydrogen nuclei join to form helium nuclei.
Nuclear fission, where helium nuclei split into hydrogen nuclei.
Nuclear fusion, where helium nuclei join to form hydrogen nuclei.
Nuclear fission, where hydrogen nuclei split into helium nuclei.
20 exam-style questions on CIE IGCSE Physics 6.2.1 The Sun as a star. Each one has a worked solution and a mark scheme showing where the marks go.