When hot and cold water mix, the total energy is unchanged but:

  1. energy is destroyed
  2. entropy decreases
  3. entropy increases and the ability to do work is lost
  4. the water heats up more
Answer

C) entropy increases and the ability to do work is lost

The temperature difference is gone. SLO P-11-C-19 · Understanding

Physics MCQ · More Heat Engines, Second Law and Entropy MCQs · Practise