IGCSE Physics: Sound Waves & Hearing Range | Edexcel Modular | Unit 5 | L10

IGCSE Physics: Sound Waves & Hearing Range | Edexcel Modular | Unit 5 | L10

This lesson covers spec points 5.23 and 5.24P — sound as a longitudinal wave, transmission through media, and the human hearing range of 20–20,000 Hz.

PowerPoint includes:
• Retrieval starter comparing light and sound wave properties
• Direct Instruction (I Do) — sound as longitudinal wave; compressions and rarefactions explained; speed in solids/liquids/gases; human hearing range stated
• Guided Practice (We Do) — frequency classification task (audible/ultrasound); wave properties calculation; dog whistle application question
• Independent Practice (You Do) — sound propagation description task; steel vs air speed analysis; ultrasound frequency conversion; media ranking task
• Real-world context: QatarEnergy pipeline ultrasound crack detection
• Misconception check: do sound waves carry matter? (true/false with reasoning reveal)
• Review and Reflect traffic light

Activity Sheet includes:
• 11 exam-style questions plus stretch — spec-accurate (no infrasound)
• Q5 tests boundary cases (15 Hz, 15,000 Hz, 25,000 Hz)
• Q10 uses the Qatar hospital ultrasound context from the lesson
• Stretch question covers reflection and refraction of sound (5.23)
• Full mark scheme for teacher use