In terms of particle motion, what occurs as temperature approaches absolute zero?

• A. Particles move faster
• B. Particle motion ceases
• C. Particles lose mass
• D. Particles gain kinetic energy

Answer: (B)

As the temperature approaches absolute zero, particle motion significantly decreases, and in an ideal scenario, it would cease entirely. Absolute zero, defined as 0 Kelvin or -273.15 degrees Celsius, is the theoretical point at which particles have minimal vibrational motion. According to the principles of thermodynamics and quantum mechanics, as the temperature lowers, the energy of a system decreases, resulting in reduced kinetic energy of the particles. At absolute zero, particles would occupy their lowest energy state, leading to a complete halt in motion.

In contrast, as temperatures rise above absolute zero, particles gain energy and move faster, which makes options about increased particle speed or kinetic energy incorrect in this context. Additionally, particle mass does not change with temperature; rather, it is a constant property of the particles themselves. Therefore, as temperature approaches absolute zero, the expected behavior is a cessation of particle motion.