The molecular theory states the movement and collision of the molecules in a matter. When an object is cooled, then the molecule loses its kinetic energy. Thus, option B is correct.
What is the kinetic molecular theory?
The kinetic molecular theory explains the composition and the motion of the particles in matter. It assumes that the particles move constantly in the matter and have insignificant volume and intermolecular forces.
The particles show elastic collisions that use the ideal gas equation to show the effect of the temperature on the kinetic energy. The kinetic energy has a direct relationship with the temperature.
A decrease in temperature(cooling) of matter causes the particles to slow down their speed of collision which results in a loss in kinetic energy and is used as the principle to change liquid into solids.
Therefore, option B. the decrease in temperature reduces the kinetic energy.
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