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Across 1. ‘bouncing off’ 3. The distance between two adjacent peaks 4. The part of a sound wave that is low pressure 8. The ‘height’ of a wave. The maximum displacement from equilibrium 12. The amount of time taken for one wave to pass a set point 14. When waves overlap. Correct word superpose 15. The change in direction experienced by a wave as it moves between media

Down 2. For example radio, ultra-violet, X-rays (2 Words) 5. Where the particles oscillate in parallel to the direction the wave travels 6. Where waves encounter a gap in a barrier and spread out from it 7. Where the particles oscillate perpendicularly to the direction the wave travels 9. The spreading out of waves of different wavelengths 10. The ‘dip’ in a wave 11. The number of waves passing a given point in one second 13. The substance through which a wave is moving