| Date | May 2014 | Marks available | 1 | Reference code | 14M.1.HL.TZ1.9 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 1 |
| Command term | Question number | 9 | Adapted from | N/A |
Question
The magnitude of the potential at the surface of a planet is V. What is the escape speed from the surface of the planet?
A. \(\sqrt V \)
B. \(\sqrt {2V} \)
C. \(\sqrt {VR} \)
D. \(\sqrt {2VR} \)
Markscheme
B
Examiners report
As R is not defined in the stem it can be assumed it is irrelevant and therefore both C and D are incorrect. As we need to equate kinetic energy with potential energy to solve this problem, we can expect a factor of 2 from 1⁄2 mv2. Hence B.
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