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QPage 60: Q15: HC Verma: Concepts of Physics - Volume 2 Laws of Thermodynamics Page 60: Q15 Solution: When an object cools down, heat is withdrawn from it. Does the…

When an object cools down, heat is withdrawn from it. Does the entropy of the object decrease in this process? If yes, is it a violation of the second law of thermodynamics stated in terms of increase in entropy?

Step-by-Step Verified Solution

**Answer:** Yes, the entropy of the object decreases. No, it does not violate the second law. **Step-by-Step Explanation:** When an object cools, heat is withdrawn, so its entropy decreases. However, this heat is transferred to the surroundings, **increasing the entropy of the surroundings** by a larger amount (since the surroundings are at a lower temperature). The **net entropy of the universe increases**, so the second law is not violated [citation:8].

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