IB skill practice

Use entropy and second-law reasoning

Paper 1, Paper 2 5 marks Difficulty 4

Net entropy in heat flow hot to cold

Heat \(240\,\text{J}\) flows from a hot reservoir at \(370\,\text{K}\) to a cold reservoir at \(310\,\text{K}\) in a greenhouse data audit. Calculate the net entropy change. Use the diagram first, then calculate the requested value. Enter the numerical result and choose the interpretation that matches the physics meaning.

Worked practice: physics data and result

Read the physical quantities first, then calculate the result and state what it means.