A materials laboratory investigates radiation emitted during changes in two samples.
In Sample A, an electron moves from an energy level of 5.2 × 10-19 J to a level of 2.2 × 10-19 J. Calculate the energy of the photon emitted.
Sample B contains nuclei that emit gamma rays.
State what happens to the number of protons in a nucleus when it emits gamma rays.
In another change in Sample A, an atom emits a photon with an energy of 4.5 × 10-19 J.
State whether this photon has a higher or a lower frequency than the photon in (a).
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.