Very simple entropy question

  • #1
603
6

Homework Statement


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?


Homework Equations





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.
 

Answers and Replies

  • #3
603
6
Ah of course that makes sense! Since this is an irreversible process the entropy must increase.
Thank you!
 

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