Question

A measure of the kinetic energy of particle motion within a substance is _____.

Answer 1

Answer: Option (b) is the correct answer.

Explanation:

It is known that energy obtained by an object due to its motion is known as kinetic energy. Whereas an energy obtained by an object due to its position is known as potential energy.

For example, when water is heated then bond between its molecules starts to break and therefore, molecules start to move as they tend to gain kinetic energy due to increase in temperature.

Also, it is known that K.E = $\frac{3}{2}kT$

where         k = boltzmann constant

                  T = temperature

Hence, kinetic energy is proportional to temperature. So, more is the increase in temperature more will be the increase in kinetic energy.

Thus, we can conclude that a measure of the kinetic energy of particle motion within a substance is temperature.

Answer 2

All particles (atoms and molecules) of matter have kinetic energy because they are always in motion.

A measure of the kinetic energy of particle motion within a substance is temperature. If the particles move faster, they have more kinetic energy, and the substance has a higher temperature