An ideal gas with pressure P, volume V and temperature T is expanded isothermally to a volume 2V and final pressure `P_(I)`. The same gas is expanded adiabatically to a volume 2V and final pressure in this case is `P_(A)`. In terms of the ratio of the two specific heats for the gas `gamma`, the ratio `P_(I)//P_(A)` is

Options

A. `2^(gamma-1)`
B. `2^(1-gamma)`
C. `2^(gamma)`
D. `2gamma`

Answer

A