Complete, no planning required. Start with a spaced learning task on uncertainties; have students self-assess using the provided mark scheme. Transition into semiconductors and electron levels by placing key term posters (e.g., ground state) around the room for a “scavenger hunt” retrieval activity. Connect these concepts to the invisible light spectrum by discussing how this is utilised in modern telescopes. Conclude with scaffolded calculations from the PowerPoint, followed by an independent worksheet. All answers are provided for immediate feedback. Calculations include converting eV to Joules and calculating photon absorbtion and emission.