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Which effect results when an ideal Stirling engine undergoes isochoric cooling?

A)Internal energy decreases significantly
B)Thermal efficiency reaches Carnot limit
C)Isothermal expansion becomes adiabatic
D)Volumetric work converts to heat

💡 Explanation

The ideal Stirling engine uses isochoric cooling to reduce pressure because, during *isochoric heat removal*, heat leaves while volume remains constant, therefore internal energy drops accordingly, rather than performing work.

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