1.The change in entropy when the pressure of a perfect gas is changed isothermally from P1P_1P1 to P2P_2P2 isa.ΔS=nRln(P1+P2)\Delta S = nR\ln(P_1 + P_2)ΔS=nRln(P1+P2)b.ΔS=nRln(P2/P1)\Delta S = nR\ln(P_2/P_1)ΔS=nRln(P2/P1)c.ΔS=nRln(P1/P2)\Delta S = nR\ln(P_1/P_2)ΔS=nRln(P1/P2)d.ΔS=nRln(P1+P2P2)\Delta S = nR\ln\left(\frac{P_1+P_2}{P_2}\right)ΔS=nRln(P2P1+P2)Login to continueOnly logged in users canattempt or see the solution.