DP Physics (last assessment 2024)

Question 18N.3.HL.TZ0.b

Date	November 2018	Marks available	[Maximum mark: 1]	Reference code	18N.3.HL.TZ0.b
Level	HL	Paper	3	Time zone	TZ0
Command term	Estimate	Question number	b	Adapted from	N/A

[Maximum mark: 1]

18N.3.HL.TZ0.b

The present temperature of the cosmic microwave background (CMB) radiation is 3 K. Estimate the size of the universe relative to the present size of the universe when the temperature of the CMB was 300 K.

[1]

Markscheme

$\frac{{{R_{{\text{past}}}}}}{{{R_{{\text{now}}}}}} = \frac{3}{{300}} = 0.01$ ✔

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Option D: Astrophysics

Option D: Astrophysics » Option D: Astrophysics (Additional higher level option topics) » D.5 – Further cosmology (HL only)

Option D: Astrophysics » Option D: Astrophysics (Additional higher level option topics)

Question 18N.3.HL.TZ0.b

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