A spacecraft uses a spectrometer to study radiation from an atom in the thin atmosphere of a moon and from an excited nucleus in a rock sample.
An atom absorbs a photon and later emits photon P. An excited nucleus emits photon Q.
| System | Stage | Energy in J |
|---|---|---|
| atom | before absorption | 1.2 × 10⁻¹⁹ |
| atom | after absorption | 6.0 × 10⁻¹⁹ |
| atom | after emitting photon P | 2.0 × 10⁻¹⁹ |
| nucleus | before emitting photon Q | 7.5 × 10⁻¹⁴ |
| nucleus | after emitting photon Q | 1.5 × 10⁻¹⁴ |
Calculate the energy absorbed by the atom and the energy of photon P.
Calculate how many times greater the frequency of photon Q is than the frequency of photon P.
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.