DP Physics (last assessment 2024)

Question 19N.3.SL.TZ0.11a(ii)

Date	November 2019	Marks available	[Maximum mark: 2]	Reference code	19N.3.SL.TZ0.11a(ii)
Level	SL	Paper	3	Time zone	TZ0
Command term	Determine	Question number	a(ii)	Adapted from	N/A

a(ii).

[Maximum mark: 2]

19N.3.SL.TZ0.11a(ii)

(a(ii))

Light from a hydrogen source in a laboratory on Earth contains a spectral line of wavelength 122 nm. Light from the same spectral line reaching Earth from a distant galaxy has a wavelength of 392 nm. Determine the ratio of the present size of the universe to the size of the universe when the light was emitted by the galaxy.

[2]

Markscheme

ALTERNATIVE 1

$z = \frac{392 - 122}{122} = 2.21$ ✔

$\frac{R}{R_{0}} = « 2.21 + 1 = » 3.21$ ✔

ALTERNATIVE 2

$\frac{R}{R_{0}} = \frac{392}{122}$ ✔

=3.21 ✔

Syllabus sections

Option D: Astrophysics

Option D: Astrophysics » Option D: Astrophysics (Core topics) » D.3 – Cosmology

Option D: Astrophysics » Option D: Astrophysics (Core topics)

Question 19N.3.SL.TZ0.11a(ii)

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