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1. AmplitudeThe distance through which a vibrating body moves. The amount of displacement of a vibrating body.

2. ReflectionThe bouncing back of sound waves as they strike a surface more dense than that in which they are traveling.

3. MomentumThe tendency of a displaced body to overshoot its point of rest.

4. Simple Harmonic MotionSimple vibration, the motion is in a straight line and is periodic (repeats itself in equal periods of time even thought the distance traveled gets shorter and shorter. The motion is fastest as it passes its center point of rest and has moments at each extreme when it is motionless. Perceived as a pure tone and results in a sine wave when graphed.

5. ElasticityThe bouncing back of sound waves as they strike a surface more dense than that in which they are traveling.

6. Sine WaveA graph of the simplest form of vibration showing motion in time and space.

7. PitchOur perception of frequency. The greater the frequency, the higher this is.

8. VibrationAny form of to-and-fro motion

9. resonant frequencyThe number of cycles (complete vibrations) which take place in a fixed period of time. An acoustical definition is the number of sound waves passing a given point in one second.

10. FrequencyThe number of cycles (complete vibrations) which take place in a fixed period of time. An acoustical definition is the number of sound waves passing a given point in one second.

11. SynthesizerA unit of sound intensity.

12. Cent1/100th of a chromatic semitone. It is the unit most commonly used to represent pitch deviation.

13. DecibelA unit of sound intensity.

14. Sine ToneA graph of the simplest form of vibration showing motion in time and space.

15. Transmitting mediaA transmitter of vibration from a sound source to a receiver (ear or microphone). Must be elastic for vibration to take place.

16. Rarefactiona point at which the usual number of molecules which occupy a given space are temporarily out of position, causing a partial vacuum to occur.

17. ResonanceThe number of cycles (complete vibrations) which take place in a fixed period of time. An acoustical definition is the number of sound waves passing a given point in one second.

18. LoudnessOur perception of amplitude. The greater the amplitude, the greater the perceived sound.

19. SoundA perceived, aural psychological sensation produced by vibration

20. CompressionA point in space where a number of molecules which have been set into motion bunch up causing an unusual number of molecules to occupy the same space.

21. Hearing LossThe inability to perceive certain frequencies and amplitudes which are within the common limits of perception.

22. EchoesA unit of sound intensity.