DP Physics (last assessment 2024)

Question 18M.3.SL.TZ2.12c

Date	May 2018	Marks available	[Maximum mark: 3]	Reference code	18M.3.SL.TZ2.12c
Level	SL	Paper	3	Time zone	TZ2
Command term	Determine	Question number	c	Adapted from	N/A

[Maximum mark: 3]

18M.3.SL.TZ2.12c

Data from distant galaxies are shown on the graph.

M18/4/PHYSI/SP3/ENG/TZ2/12

(c)

On the graph, one galaxy is labelled A. Determine the size of the universe, relative to its present size, when light from the galaxy labelled A was emitted.

[3]

Markscheme

z « = $\frac{v}{c}$ » = $\frac{{4.6 \times {{10}^4} \times {{10}^3}}}{{3.00 \times {{10}^8}}}$ = 0.15

$\frac{R}{{{R_0}}}$ = «z + 1» = 1.15

$\frac{{{R_0}}}{R}$ = « $\frac{1}{{1.15}}$ =» 0.87

87% of the present size

[3 marks]

Syllabus sections

Option D: Astrophysics

Option D: Astrophysics » Option D: Astrophysics (Core topics) » D.3 – Cosmology

Option D: Astrophysics » Option D: Astrophysics (Core topics)

Question 18M.3.SL.TZ2.12c

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