Across
- 3. empty space
- 5. a wave that is produced by a vibrating object that travels through matter
- 7. a disturbance that transfers energy from one place to another
- 8. instruments that use echolocation to locate objects
- 11. the increasing of the strength of an electrical signal
- 14. sending out ultrasound waves and interpreting the returning sound echoes
- 15. distance from waves rest level to the crest or trough
- 21. the change in perceived pitch that occurs when the source or the receiver of a sound is moving
- 24. the direction in which the wave travels is perpendicular, or at right angles, to the direction of the disturbance
- 26. the number of waves passing a fixed point in a certain amount of time
Down
- 1. any substance that a wave moves through
- 2. lowest point of a wave
- 3. a rapid, back-and-forth motion
- 4. the amount of energy a sound wave has
- 6. the spreading out of waves through an opening or around the edge of an obstacle
- 9. the bending of a wave as it enters a new medium at an angle other than 90 degrees
- 10. waves that transfer energy through matter
- 12. wave that travels in the same direction as the disturbance
- 13. unit used to measure intensity
- 16. one complete wave or cycles, per second
- 17. distance from one wave crest to the next wave crest
- 18. the scientific study of sound
- 19. sound waves in the range above 20,000 hertz
- 20. the meeting and combining of waves
- 22. the bouncing back of a wave after it strikes a barrier
- 23. the characteristic of highness or lowness of a sound
- 25. highest point of a wave