An atom in a gas sample has the energy levels shown in the table.
| Energy level | Energy |
|---|---|
| Lowest | 1.0 × 10-19 J |
| Middle | 3.4 × 10-19 J |
| Highest | 7.0 × 10-19 J |
An electron starts at the highest energy level and moves to the middle energy level, emitting a photon.
Calculate the energy of the emitted photon.
Compare the frequency of a photon emitted when the electron moves from the middle energy level to the lowest energy level with the frequency of the photon in part (a). Explain your answer.
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.