Sound Waves: Good Vibrations

A complete, ready-to-teach KS3 lesson on sound, written for Year 8.

Pupils start with a big question: why can’t you hear sounds in space? They build up the answer step by step, from vibrations to the human ear.

What’s covered

• How vibrations make sound
• Sound as a longitudinal (pressure) wave
• Why sound needs a medium, and why it can’t travel through a vacuum
• Speed of sound in air, water and wood, with speed = distance ÷ time calculations
• Frequency, pitch, amplitude and loudness
• Echoes, reflection and absorption
• How the ear works: eardrum, ear bones, cochlea and auditory nerve
• Human hearing range and ultrasound

What’s included

• 12-slide PowerPoint in a light, colourful sound-wave style, with a question and answer on every slide
• Teacher notes on every slide, including common misconceptions and source codes
• 4-page worksheet (PDF) with Core, Stretch and Challenge questions, a spot-the-mistake task and a full answer key
• Homework sheet (PDF, 26 marks) including echo calculations, with a full mark scheme
• One-page knowledge organiser (PDF) for revision
• Puzzle pack (PDF): unscramble the key words, true or false and odd one out, with answers
• Exit quiz with answers, including a speed calculation