An ideal gas is compressed isothermally until its pressure is doubled and then allowed to expand adiabatically to regain its original volume (g = 1.4 and 2 –1.4 = 0.38). The ratio of the final to initial pressure is
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A
Let V be the original volume of the gas. For a isothermal process PV = constant
For an adiabatic process
= Constant
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