Across
- 1. these waves can travel through a vacuum
- 4. ___ waves need a medium to travel
- 7. wavelength is measured in this unit
- 10. the substance a wave travels through
- 11. the vibrations are perpendicular to the direction of wave travel
- 14. a sound wave with a large amplitude is __
Down
- 2. the vibrations are parallel to the direction of wave travel
- 3. a light wave with a large amplitude is __
- 5. the height of a wave from the center line up or from the center line down
- 6. the number of waves that pass in one second
- 8. the horizontal distance from crest to crest
- 9. the time it takes for one wave to pass
- 12. the wavelength divided by period
- 13. ___ waves are longitudinal