O-LevelPhysicsNuclear Physics5054/12 · May/June 2023 · Q401 Mark
Four of the stages in the life cycle of a star, until it becomes a red giant, are shown. W Inward force of gravitational attraction is balanced by an outward force from its centre. X Internal gravitational collapse produces an increase in temperature. Y It expands. Z Most of the hydrogen has been converted to helium. In which order do these stages occur, starting with the earliest?
AW→X→Y→Z
BW→X→Z→Y
CX→W→Y→Z
DX→W→Z→Y
✓ Correct answer
D: X→W→Z→Y
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