Two equal masses of water at 60 °C and 40 °C are mixed adiabatically in a perfectly…

PHYSICS · Single correct · A Level · Physics · Engineering physics · Engineering physics

Problem

Two equal masses of water at 60 °C and 40 °C are mixed adiabatically in a perfectly insulated beaker. Which one of the following statements correctly describes the entropy change (ΔS\Delta S)? (a) ΔSsys<0,  ΔSsurr>0\Delta S_{\text{sys}}<0,\; \Delta S_{\text{surr}}>0 (b) ΔSsys=ΔSsurr=0\Delta S_{\text{sys}}=\Delta S_{\text{surr}}=0 (c) ΔSsys>0,  ΔSsurr=0\Delta S_{\text{sys}}>0,\; \Delta S_{\text{surr}}=0 (d) ΔSsys>0,  ΔSsurr<0\Delta S_{\text{sys}}>0,\; \Delta S_{\text{surr}}<0

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