Across
- 5. wave: a wave that travels only through matter
- 7. the change in direction of a wave as it changes speed, moving from one medium into another.
- 8. wave: a wave in which the disturbance is perpendicular to the direction the wave travels.
- 9. the maximum distance a wave varies from its rest position.
- 10. sound energy passes into air particles, and the person on the other side hears the knock.
Down
- 1. the distance between a point on one wave, such as the crest, and the same point on the next wave.
- 2. the number of wavelengths that pass a point each second.
- 3. energy you produce that bounces back, causing an echo
- 4. wave: a wave that can travel through empty space or through matter
- 6. wave: a wave that makes the particles of a medium move back and forth parallel to the direction the wave travels.