Date | November 2020 | Marks available | 1 | Reference code | 20N.3.HL.TZ0.6 |
Level | Higher level | Paper | Paper 3 | Time zone | 0 - no time zone |
Command term | Define | Question number | 6 | Adapted from | N/A |
Question
A deuterium nucleus (rest mass ) is accelerated by a potential difference of .
Define rest mass.
Calculate the total energy of the deuterium particle in .
In relativistic reactions the mass of the products may be less than the mass of the reactants. Suggest what happens to the missing mass.
Markscheme
invariant mass
OR
mass of object when not in motion/in object’s rest frame ✓
«rest energy =» ✓
✓
Final answer accept if unit given
Award [2] marks for a bald correct answer.
is converted to energy ✓
as kinetic energy of the products ✓
Examiners report
The definition of rest mass proved to be known by most candidates.
Most were able to score full marks. A few candidates messed up by trying to convert to J, although some were successful with this additional difficulty.
Answers scored at least one or usually both marks.