An atom starts with 3 energy units. After absorbing radiation its energy is 8 units, and after emitting radiation its energy is 4 units. An excited nucleus in a separate experiment also emits radiation. Which statement is correct?
The atom absorbs 8 units and emits 4 units; the nucleus gains energy.
The atom absorbs 5 units and emits 4 units; the nucleus gains energy.
The atom absorbs 8 units and emits 4 units; the nucleus loses energy.
The atom absorbs 5 units and emits 4 units; the nucleus loses energy.
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.