Question

Which sample of copper has atoms with the lowest average kinetic energy? 1. 10. g at 45°C 2. 20. g at 35°C 3. 30. g at 25°C 4. 40. g at 15°C

Answer 1

I would say 4. 40. g at 15°C because kinetic energy is related to temperature and not mass, so the lower temp would give you lower KE

Answer 2

Answer: Option (4) is the correct answer.

Explanation:

Kinetic energy is the energy that occurs due to the motion of particles or object.

More is the temperature provided to an atom more will be the movement of its particles. Thus, more will be the average kinetic energy of the atom.

Similarly, less is the temperature provided to a metal then less will be the movement of its molecules. Hence, at low temperature movement of molecules will be less.

Thus, out of the given options 40 gram of copper at $15^{o}C$ will have the lowest average kinetic energy.