DP Physics (last assessment 2024)
Question 18N.3.HL.TZ0.20
| Date | November 2018 | Marks available | [Maximum mark: 4] | Reference code | 18N.3.HL.TZ0.20 |
| Level | HL | Paper | 3 | Time zone | TZ0 |
| Command term | Outline, State | Question number | 20 | Adapted from | N/A |
20.
[Maximum mark: 4]
18N.3.HL.TZ0.20
(a)
Outline what is meant by dark energy.
[2]
Markscheme
energy filling all space ✔
resulting in a repulsive force/force opposing gravity ✔
accounts for the accelerating universe ✔
makes up about 70% of «the energy» of universe ✔
(b)
State two candidates for dark matter.
[2]
Markscheme
black hole ✔
brown dwarf ✔
massive compact halo object /MACHO✔
neutrinos ✔
weakly interacting massive particle /WIMP ✔
