DP Physics (last assessment 2024)
Question 19M.3.HL.TZ1.b
| Date | May 2019 | Marks available | [Maximum mark: 2] | Reference code | 19M.3.HL.TZ1.b |
| Level | HL | Paper | 3 | Time zone | TZ1 |
| Command term | Suggest | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 2]
19M.3.HL.TZ1.b
Suggest why type I a supernovae were used in the study that led to the conclusion that the expansion of the universe is accelerating.
[2]
Markscheme
«it was necessary» to measure the distance «of very distant objects more accurately» ✔
type I a are standard candles/objects of known luminosity ✔
Examiners report
Part b) was well answered by most of the prepared candidates with a good understanding that these stars behave as “standard candles”.
