A heater supplies 150 J of energy to a block of copper. The temperature of the block rises by 30∘C30^\circ\text{C}30∘C.
What happens to the block of copper when its temperature falls by 20∘C20^\circ\text{C}20∘C?
Its internal energy decreases by 100 J100\text{ J}100 J.
Its internal energy decreases by 225 J225\text{ J}225 J.
Its internal energy increases by 100 J100\text{ J}100 J.
Its internal energy increases by 225 J225\text{ J}225 J.
119 exam-style questions on CIE IGCSE Physics 2.2.2a Internal energy and temperature. Each one has a worked solution and a mark scheme showing where the marks go.