DP Physics (last assessment 2024)
Question 19M.3.SL.TZ2.ai
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.3.SL.TZ2.ai |
| Level | SL | Paper | 3 | Time zone | TZ2 |
| Command term | Show that | Question number | ai | Adapted from | N/A |
ai.
[Maximum mark: 2]
19M.3.SL.TZ2.ai
The Hubble constant is 2.3 × 10-18 s-1.
A galaxy is 1.6 × 108 ly from Earth. Show that its recessional speed as measured from Earth is about 3.5 × 106 m s-1.
[2]
Markscheme
d = «1.6 × 108 × 9.46 × 1015 =» 1.51 × 1024 «m»✔
v = «H0d = 2.3 × 10−18 ×1.5 × 1024 =» 3.48 × 106 «m s–1» ✔
Answer given, correct working required or at least 3sf needed for MP2.
Examiners report
This very simple application of Hubble’s law was answered correctly by the vast majority of candidates.
