# A diver is swimming underwater in the sea. The diver hears a boat engine that is some distance away. Explain how the sound from the boat engine is able to travel through the water and reach the diver's ears.

> Eduqas GCSE Physics — 5.1 Waves in air, fluids and solids · Explain · 4 marks

## Mark scheme (4 marks)

1. The boat engine causes vibrations / the engine vibrates
2. The vibrations cause water molecules/particles to vibrate / the water particles are disturbed
3. The vibrations are passed from one particle to the next / energy is transferred through the water by particles vibrating and passing on the disturbance
4. Sound can travel through liquids / water is a medium through which sound waves can travel (it does not need air)

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