DP Physics (last assessment 2024)
Question 18N.3.HL.TZ0.17c
| Date | November 2018 | Marks available | [Maximum mark: 2] | Reference code | 18N.3.HL.TZ0.17c |
| Level | HL | Paper | 3 | Time zone | TZ0 |
| Command term | Describe | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 2]
18N.3.HL.TZ0.17c
A distinctive feature of the constellation Orion is the Trapezium, an open cluster of stars within Orion.
(c)
The Great Nebula is located in Orion. Describe, using the Jeans criterion, the necessary condition for a nebula to form a star.
[2]
Markscheme
mass of gas cloud > Jeans mass ✔
«magnitude of» gravitational potential energy > Ek of particles ✔
cloud collapses/coalesces «to form a protostar» ✔
