Lesson Plan

• Describe the biological effects of excessive exposure to microwaves, infrared and ultraviolet radiation.
• Explain how wavelength and photon energy relate to the type of tissue damage observed.
• Identify common everyday sources of harmful EM radiation and the associated health risks.
• Apply basic safety measures (e.g., shielding, sunscreen, exposure time limits) to reduce risk.
• Analyse a short case study and recommend appropriate protective actions.

• Projector and screen
• PowerPoint slides summarising each EM region
• Printed handout with the summary table
• Worksheet with case‑study scenarios
• Images of microwave oven, infrared lamp, UV index chart
• Sunscreen sample and safety‑shielding poster

Begin with a striking image of a sunburned child and ask students what caused it. Link this to prior knowledge of the electromagnetic spectrum and highlight today’s focus on harmful effects. State that by the end of the lesson they will be able to describe risks and suggest practical safety measures.

1. Do‑Now (5'): Students list everyday devices that emit EM radiation.
2. Mini‑lecture (10'): Overview of the EM spectrum with emphasis on microwaves, IR and UV; show diagram.
3. Group activity (12'): Each group examines a handout section (microwaves, IR, UV) and creates a 2‑minute poster on effects and sources.
4. Gallery walk (8'): Groups view each other’s posters, note key points on worksheet.
5. Whole‑class discussion (10'): Consolidate findings, compare severity, and link photon energy to tissue damage.
6. Case‑study analysis (10'): Students read a short scenario (e.g., prolonged sauna use) and propose safety recommendations.
7. Check for understanding (5'): Quick quiz via Kahoot or show of hands.

Recap the three main radiation types, their health impacts and protective strategies. Ask students to write one “take‑away” sentence on an exit ticket. Assign homework: research a real‑world safety guideline (e.g., sunscreen SPF rating) and prepare a brief summary for the next class.