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Question 19N.3.HL.TZ0.16b(iii)

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.3.HL.TZ0.16b(iii)
Level HL Paper 3 Time zone TZ0
Command term Discuss Question number b(iii) Adapted from N/A
b(iii).
[Maximum mark: 2]
19N.3.HL.TZ0.16b(iii)

Evidence from the Planck space observatory suggests that the density of matter in the universe is about 32 % of the critical density of the universe.

(b(iii))

It is estimated that less than 20 % of the matter in the universe is observable. Discuss how scientists use galactic rotation curves to explain this.

[2]

Markscheme

rotation speed of galaxies is larger than expected away from the centre ✔

there must be more mass «at the edges» than is visually observable «indicating the presence of dark matter» ✔

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