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Question 18M.3.SL.TZ1.12b

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.3.SL.TZ1.12b
Level SL Paper 3 Time zone TZ1
Command term Estimate Question number b Adapted from N/A
b.
[Maximum mark: 2]
18M.3.SL.TZ1.12b

The Hubble constant is accepted to be 70 km s–1 Mpc–1. This value of the Hubble constant gives an age for the universe of 14.0 billion years.

The accepted value of the Hubble constant has changed over the past decades.

The redshift of a galaxy is measured to be z = 0.19.

(b)

Estimate, in Mpc, the distance between the galaxy and the Earth.

[2]

Markscheme

v = «zc = 0.19 × 3 × 108 =» 5.7 × 107 «ms–1»

d = « v H 0 = 5.7 × 10 4 70 » = 810Mpc     OR     8.1× 108 pc

 

Correct units must be present for MP2 to be awarded.

Award [2] for BCA.

[2 marks]

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