2024 · M/J · 9702/41 | Q10

0/49parts marked · 0 of 94 marks

Question (10 of 10)9 marks · Practise this topic →

Options

Available practice: 94 of 100 marks. Parts 3(a)(i), 7(a), 8(a) await marking support. Scores cover available parts only.

(a)(i)State what is meant by the luminosity of a star.

Answer guidance

State A short answer. No explanation is needed, and adding one cannot earn extra marks.

[2 marks]

(a)(ii)Explain how a standard candle in a distant galaxy can be used to determine the distance of the galaxy from an observer.

Answer guidance

Explain Give reasons, not just what happens. Each distinct reason is usually worth a mark.

[3 marks]

The Sun has a radius of 6.96 × 10⁸ m and a surface temperature of 5780 K. Light from the Sun is observed to have a peak intensity at a wavelength of 501 nm.

(b)(i)Calculate the luminosity of the Sun. Give a unit with your answer.

Answer guidance

Calculate Show your working. The method can earn marks even when the final value is wrong, and a bare answer often cannot.

[2 marks]

Light from the Sun, which has a surface temperature of 5780 K, is observed to have a peak intensity at a wavelength of 501 nm. Another star emits radiation that has a peak intensity at a wavelength of 624 nm.

(b)(ii)Determine the surface temperature of this star.

Answer guidance

Determine Work it out from what you are given or from the figure, and show how you got there.

[2 marks]

9702/41/M/J/24Cambridge International AS & A Level Physics 9702 · May/June 2024 · Paper 4 variant 1 · Question 10