DP Physics (last assessment 2024)

Question 20N.3.SL.TZ0.16

Date	November 2020	Marks available	[Maximum mark: 2]	Reference code	20N.3.SL.TZ0.16
Level	SL	Paper	3	Time zone	TZ0
Command term	Calculate, Outline	Question number	16	Adapted from	N/A

16.

[Maximum mark: 2]

20N.3.SL.TZ0.16

(a)

The light from a distant galaxy shows that $z = 0.11$ .

Calculate the ratio $\frac{size of the universe when the light was emitted}{size of the universe at present}$ .

[1]

Markscheme

« $\frac{R_{0}}{R} =$ »

$\frac{1}{1.11}$ OR $0.90$ OR $90 %$ ✓

(b)

Outline how Hubble’s law is related to $z$ .

[1]

Markscheme

«Hubble’s » measure of v/recessional speed uses redshift which is $z$
OR
redshift ( $z$ ) of galaxies is proportional to distance «from earth»
OR
combines $v = H d$ AND $z = \frac{v}{c}$ into one expression, e.g. $z = \frac{H d}{c}$ . ✓

OWTTE

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 20N.3.SL.TZ0.16

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