DP Physics (last assessment 2024)
Question 19M.3.SL.TZ2.6a
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.3.SL.TZ2.6a |
| Level | SL | Paper | 3 | Time zone | TZ2 |
| Command term | Define | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 1]
19M.3.SL.TZ2.6a
A train of proper length 85 m moves with speed 0.60c relative to a stationary observer on a platform.
(a)
Define proper length.
[1]
Markscheme
the length measured «in a reference frame» where the object is at rest ✔
Examiners report
Proper length is quite well understood. A common mistake is to mention that it is the length measured by a reference frame at rest.
