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Across 1. A wave in which the particles of the medium vibrate parallel to the direction the wave is travelling 6. The SI unit for temperature, water freezes at 273 and boils at 373 8. The time that it takes a complete cycle of wave oscillation to occur 9. The distance from any point on a wave to an identical point on the next wave 10. Where the longitudinal wave is stretched out 12. A change in the direction of a wave when the wave find an obstacle or an edge, such as an opening 13. The amount of heat energy required to raise one gram of a substance one degree celsius 16. Waves that require a medium 17. Where a longitudinal wave is compressed 18. A wave in which the particle of the medium moves perpendicular to the direction the wave is travelling 19. A physical environment in which phenomena occur 21. When two or more waves of the same frequency collide 22. The bending of a wavefront as the wave passes through two substances in which the speed of the wave differs 23. Highest point of a wave 24. The number of cycles or vibrations per unit of time

Down 2. Light is an example of this, electric and magnetic fields in space 3. Lowest point of a wave 4. The bouncing back of a ray of light, sound or heat when the ray hits a surface that it cannot go through 5. Temperature scale, water freezes at 32 and boils at 212 7. The temperature at which all molecular motion stops 11. The maximum distance that particles of a wave's medium vibrate from their rest position 14. An observed change in frequency of a wave when the source or observer is moving 15. A periodic disturbance in a solid, liquid or gas as energy is transmitted through a medium 18. A measure of how hot or how cold something is, specifically a measure of the average kinetic energy of the particles in an object 20. Temperature scale, water freezes at 0 and boils at 100