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Question 19M.3.HL.TZ2.22c

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.3.HL.TZ2.22c
Level HL Paper 3 Time zone TZ2
Command term Estimate Question number c Adapted from N/A
c.
[Maximum mark: 1]
19M.3.HL.TZ2.22c

The homogeneous model of the universe predicts that it may be considered as a spherical cloud of matter of radius r and uniform density ρ. Consider a particle of mass m at the edge of the universe moving with velocity v and obeying Hubble’s law.

(c)

The accepted value for the Hubble constant is 2.3 × 10−18 s−1. Estimate the critical density of the universe.

[1]

Markscheme

9.5 × 10−27 « kgm–3» ✔

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