Sound: Production, Propagation and Properties

Sound is a mechanical wave produced by vibrating bodies and transmitted through a material medium as compressions and rarefactions. This topic covers how sound is produced, how it travels, and the key properties — freque…

• Sound is a mechanical, longitudinal wave that requires a medium (solid, liquid, or gas) to propagate.
• Sound cannot travel through a vacuum because there are no particles to compress and expand.
• In a sound wave, particles oscillate about their rest positions; the wave (energy) travels, not the particles.

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