## College Physics (4th Edition)

We can write an expression for the average kinetic energy: $\overline{KE} = \frac{3}{2}~\frac{PV}{N}$ $\overline{KE} = \frac{3}{2}~kT$ The average kinetic energy can not be found from pressure only, or from number of molecules only. However, since the value of $k$ is a constant, the average kinetic energy can be found from temperature only. The correct answer is: (c) temperature only