# Very simple entropy question

**1. The problem statement, all variables and given/known data**

The temperature at the surface of the Sun is approximately

5 700 K, and the temperature at the surface of the

Earth is approximately 290 K. What entropy change

occurs when 1 000 J of energy is transferred by radiation

from the Sun to the Earth?

**2. Relevant equations**

**3. The attempt at a solution**

So I know how to solve this problem. My question is more about the sign than about the calculation.

I left my answer of ΔS as negative, but the book lists it as positive. It seems to me like the change should be negative because the T is cooler on earth hence entropy should decrease within this closed system.

http://ift.tt/1gZK4Hg

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