The Life of a Star
3 marks · NormalA star cools from 10,000 K to 4,000 K as it becomes a red giant. By what factor has the surface temperature changed? Give your answer to 2 significant figures.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
0.40 (±0.02)
Common mistakes: calculating difference, not ratio
Show mark scheme and worked solution
Marking points
M1 · 1 mark · Sets up division: 4000/10000
A1 · 1 mark · Evaluates the division: 0.4
A2 · 1 mark · States answer to 2 significant figures.
Worked solution