This how it works covers How It Works: Why Sound Travels Faster in Solids within Sound Waves for GCSE Physics. Revise Sound Waves in Waves for GCSE Physics with 13 exam-style questions and 15 flashcards. Use this page as part of a wider topic revision path rather than treating it as an isolated fact. It is section 6 of 13 in this topic. Use this how it works to connect the idea to the wider topic before moving on to questions and flashcards.
⚙️ How It Works: Why Sound Travels Faster in Solids
Sound is transmitted by particles vibrating and passing kinetic energy to neighbouring particles through intermolecular forces. In a solid, particles are tightly packed and held together by strong bonds. When one particle is displaced, it almost immediately pulls or pushes the next one — the "message" travels quickly. Think of a row of magnets on a table: push one and the force is transmitted nearly instantly along the row.
In a gas, molecules are far apart and interact weakly. A displaced molecule must travel some distance before it collides with the next one. This makes energy transfer slower — hence slower sound speed in gases. Liquids are intermediate: particles are close but not rigidly bonded.
Temperature also matters: warmer air has faster-moving molecules, so energy is transferred between molecules more quickly, increasing the speed of sound.
Practice questions for Sound Waves
What type of wave is sound?
Describe how a sound wave is produced and how energy is transferred by a longitudinal wave.