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Across 7. the interference of 2 waves of equal frequency and opposite phase 10. is the application of balanced inward ("pushing") forced to different points 11. movement to and from with a swaying motion 14. transfers energy through a medium 15. is a moving wave that happens perpendicular to the energy transfer direction 16. the maximum extent of vibration 17. process that a beam of light is spread out 18. the change in direction of a wave 19. a wave vibrating in the direction of propagation 20. the distance between 2 peaks of a wave

Down 1. the interference of 2+ waves equal in frequency & phase 2. a substance that makes possible transfer of energy from one location to another 3. waves that can travel through the vacuum of outer space 4. point of a wave with the maximum value 5. how often an event repeats itself over a set amount of times 6. a reflection of sound that arrives at the listener with a delay 8. the speed a wave travels 9. the lowest point in a cycle 12. reduction of an item's density 13. the fact of light being deflected in a passing obliquely through the interface between mediums