(a) An ideal gas initially at pressure p0 undergoes a free expansion
until its volume is 3.00 times its initial volume.What then
is the ratio of its pressure to p0? (b) The gas is next slowly and adiabatically
compressed back to its original volume. The pressure after
compression is (3.00)1/3p0. Is the gas monatomic, diatomic, or
polyatomic? (c) What is the ratio of the average kinetic energy per
molecule in this final state to that in the initial state?