DP Physics (last assessment 2024)
Question 18M.3.HL.TZ1.19b
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.3.HL.TZ1.19b |
| Level | HL | Paper | 3 | Time zone | TZ1 |
| Command term | Draw | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 2]
18M.3.HL.TZ1.19b
A galaxy can be modelled as a sphere of radius R0. The distance of a star from the centre of the galaxy is r.
For this model the graph is a simplified representation of the variation with r of the mass of visible matter enclosed inside r.
(b)
Draw on the axes the observed variation with r of the orbital speed v of stars in a galaxy.
[2]
Markscheme
linear / rising until R0
then «almost» constant
[2 marks]