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Across 5. low point on a transverse wave 8. distance a wave travels in a given amount of time (s = f x w) 10. molecules are farther 11. the material through which a wave travels 13. molecules are closed 14. interaction of two or more waves 16. ability to do work 18. waves that require a medium 19. number of waves per second, unit used to measure frequency (Hz) 20. particles are far apart on a longitudinal wave 21. number of waves that pass a point in a certain amount of time

Down 1. repeated back and forth or up and down motion 2. particles are close together on a longitudinal wave 3. vibrates the meduim in the same direction in which the wave travels 4. a disturbance involving the transfer of energy from place to place 6. the maximum distance the medium vibrates from the rest position 7. waves bounced back after hitting a barrier 9. a wave that vibrates the medium at right angles or perpendicular to the direction in which the wave travels 12. the distance between two corresponding parts of a wave 15. the bending of a wave as it moves 17. high point on a transverse wave