An atom starts with 4 energy units. It absorbs 7 energy units as radiation, then emits 5 energy units as radiation. Which statement gives its final energy and correctly describes the second transfer?
2 units; energy passes from the atom to the radiation.
6 units; energy passes from the radiation to the atom.
6 units; energy passes from the atom to the radiation.
2 units; energy passes from the radiation to the atom.
104 exam-style questions on Edexcel GCSE Physics 5.4 Uses and dangers of EM radiation, covering 5.4.1 Dangers of electromagnetic radiation, 5.4.2 Uses of electromagnetic radiation, 5.4.3 Radio waves and oscillations in circuits, and 5.4.4 Changes in atoms and nuclei generating radiation. Each one has a worked solution and a mark scheme showing where the marks go.