4.5.119 - Particle energy and mass units

Be able to use MeV and GeV (energy) and MeV/c2, GeV/c2 (mass) and convert between these and SI units.

Use - particle energy and mass units to connect the rule to the data and decision in the question.

This matters because - particle energy and mass units determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply - particle energy and mass units to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: - Particle energy and mass units is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.