| Date | November 2020 | Marks available | 1 | Reference code | 20N.3.SL.TZ0.16 |
| Level | Standard level | Paper | Paper 3 | Time zone | 0 - no time zone |
| Command term | Calculate | Question number | 16 | Adapted from | N/A |
Question
The light from a distant galaxy shows that z=0.11.
Calculate the ratio size of the universe when the light was emittedsize of the universe at present.
[1]
a.
Outline how Hubble’s law is related to z.
[1]
b.
Markscheme
« R0R= »
11.11 OR 0.90 OR 90% ✓
a.
«Hubble’s » measure of v/recessional speed uses redshift which is z
OR
redshift (z) of galaxies is proportional to distance «from earth»
OR
combines v=Hd AND z=vc into one expression, e.g. z=Hdc. ✓
OWTTE
b.
Examiners report
[N/A]
a.
[N/A]
b.
