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IGCSE Physics Waves

Unit 1
Electromagnetic spectrum
Introduction to the Electromagnetic SpectrumElectromagnetic Waves in DetailElectromagnetic Spectrum Examples
Unit 3 • Chapter 2

How does Sound Travel?

Video Summary

Sound waves travel through the air as a series of compressions and rarefactions. The compressions are caused by the vibrating object pushing on the air molecules in front of it, and the rarefactions are caused by the object pulling on the air molecules behind it. The speed of sound waves depends on the temperature and density of the air.

Knowledge Check

What are the 5 key concepts shown in the thought experiment that will help you better understand sound waves and waves in general?

What is a wave?

What is the speed of sound in water?