What happens to the average kinetic energy of particles when a substance is heated (Temperature changes in a system and specific heat capacity)

The correct answer is It increases.

Graph lens: Read the trend, flat section, gradient, or axis labels before explaining the physical meaning. This question asks: What happens to the average kinetic energy of particles when a substance is heated (Temperature changes in a system and specific heat capacity). The correct response is It increases, because specific heat capacity links energy, mass, material and temperature change. In Temperature changes in a system and specific heat capacity, the marking point should connect directly to describe why insulation is used in specific heat capacity experiments. If the question includes values, the working must keep the appropriate unit and operation; if it is an explanation, it must name the relevant particle behaviour or energy change. This item belongs to Internal energy and energy transfers, so avoid answers that switch to a different quantity, confuse heat with temperature, or describe gas pressure without collisions when collisions are the reason. Checkpoint 339 is distinct because it uses this exact question context and the graph lens rather than a generic particle-model sentence.