A brief electrical discharge supplies energy to atoms in a gas. The gas continues to emit light for a short time after the discharge ends, then becomes dark. Explain, in terms of energy changes in the atoms, why the light emission ends.
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.