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Question 19N.3.HL.TZ0.b(ii)

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

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.

Calculate the density of matter in the universe, using the Hubble constant 70 km s–1 Mpc–1.

[3]

Markscheme

H=«70×103106×3.26×9.46×1015=»2.27×10-18 «s-1»✔

ρ=0.32×3×2.27×10-1828π×6.67×10-11✔

3.0×10-27 «kg m-3»✔

NOTE: MP1 for conversion of H to base units.
Allow ECF from MP1, but NOT if H is left as 70.

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