DP Physics (last assessment 2024)
Question 18M.3.SL.TZ1.c
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.3.SL.TZ1.c |
| Level | SL | Paper | 3 | Time zone | TZ1 |
| Command term | Outline | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 2]
18M.3.SL.TZ1.c
The graph shows the observed spectrum from star X.
The second graph shows the hydrogen emission spectrum in the visible range.
Star X is likely to evolve into a stable white dwarf star.
Outline why the radius of a white dwarf star reaches a stable value.
[2]
Markscheme
the star «core» collapses until the «inward and outward» forces / pressures are balanced
the outward force / pressure is due to electron degeneracy pressure «not radiation pressure»
[2 marks]