**P. 4079.** There is a sample of neon in a cylinder which is closed by a piston. The gas is compressed such that its volume decreased to two-thirds of the original volume. The *p*, *V* graph of the process is a straight line segment. In the final state the pressure of the gas is twice as much as it was originally.

*a*) By what factor did the absolute temperature of the gas increased?

*b*) How much thermal energy was absorbed by the gas from its environment?

*c*) How can this process be realized?

(5 points)

**Deadline expired on 11 June 2008.**