Across
- 4. the ability to do work
- 5. a disturbance that carries energy through matter or space
- 6. material through which waves travel
- 8. the location of objects by reflected sound, in particular that used by animals such as dolphins or bats
- 9. the quality of a sound made by the number of vibrations (the highness or lowness of a sound)
- 11. the change in direction of a wave due to a change in its medium
- 12. waves that move the medium parallel to the direction in which the waves travel
- 13. a wave that transfers energy perpendicular to its medium: the energy moves one direction while the medium moves at a right angle to it
- 14. vibrations that travel through the air or another medium and can be heard when they reach a person's or animal's ear
- 17. parts where the waves are spread out
- 19. a sound or series of sounds caused by the reflection of sound waves from a surface back to the listener
- 20. a repeated back and forth or up and down motion
- 21. measure of wave energy; the distance between a waves' resting point and the top or crest of the wave
Down
- 1. the apparent bending of waves around a small obstacle
- 2. an increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move toward (or away from) each other
- 3. a wave that requires a medium in which to travel and carry energy
- 7. the highest point of a transverse wave
- 10. parts where the waves are close together
- 15. to bounce off
- 16. the distance between two corresponding parts of a wave
- 18. the lowest point of a transverse wa