If heat Q flows reversibly from the system to the surroundings at To, what will be the effect on entropy?

Question:If heat Q flows reversibly from the system to the surroundings at To, what will be the effect on entropy?

1.entropy of the system is reduced by Q/To

2.system has lost entropy to the surroundings

3.entropy increase of the surroundings is Q/To

4.all of the mentioned


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