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AP Physics 2
9.6 Entropy and the Second Law of Thermodynamics
IntermediateMCQConceptual18.2k
A block diagram showing two thermal reservoirs. At the top is a rectangular box labeled 'Hot Reservoir' with text 'T_H = 400 K'. At the bottom is a rectangular box labeled 'Cold Reservoir' with text 'T_C = 300 K'. A vertical arrow points downward from the hot reservoir to the cold reservoir, labeled 'Q = 600 J'. No other labels, lines, text, or axes appear.
Thermal energy transfer Q between two constant-temperature reservoirs.
A thermal energy of \(600\text{ J}\) transfers spontaneously by conduction from a hot reservoir kept at a constant temperature of \(400\text{ K}\) to a cold reservoir kept at a constant temperature of \(300\text{ K}\), as shown in the diagram. Which of the following correctly compares the magnitude of the entropy change of the cold reservoir \(|\Delta S_{\text{cold}}|\) to that of the hot reservoir \(|\Delta S_{\text{hot}}|\), and states the net change in the entropy of the universe \(\Delta S_{\text{univ}}\)?

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