PS 6.2.2 & 6.2.3

2. The most common unit used to measure intensity of a sound.
7. Instruments that are shaken, struck, brushed or rubbed are from this family.
8. Places where music cannot be heard because of destructive interference.
9. The average rate that flows through a defined area.
10. A sound with a frequency higher than 20,000Hz.
13. A method of using ultrasonic waves to calculate underwater distances or located underwater objects.
14. The quality of a sound that distinguishes it from other sounds of the same pitch and volume.
16. These instruments have a column of air through which sound waves travel.
17. The way in which a person perceives the intensity of sounds waves.
18. Sound frequency depends on the length of the length of the object being _________.
19. How high or low a sound is.
20. Much of the energy that is released in the form of sound during thunderstorms relates to this of the wave.

1. What occurs when an object vibrating at or near the natural frequency of a second object causes the second object to vibrate.
3. This sea creature, that is smaller than a human finger, can snap it's claws to produce a bubble that is faster than the speed of sound to stun its prey.
4. These instruments produce music from vibrations of the players lips on a mouth piece.
5. These instruments are either plucked or rubbed to produce vibrations.
6. The scientific study of sound.
8. The change in frequency and pitch of a sound caused by the motion of the sound source or the listener.
11. A method of using acoustic waves to separate oil from other contaminants.
12. A level of noise that causes irritation, pain, or damage to a part of the body.
15. Repeated timing.
21. A sound with a pleasing quality, an identifiable pitch, and a repeated timing called rhythm.