| A | B |
|---|
| wave | rhythmic disturbances that carry energy (498) |
| medium | a material through which a wave transfers energy (498) |
| transverse wave | the medium moves at right angles to the direction the wave travels (499) |
| crest | the highest points of a wave (499) |
| trough | the lowest points of a wave (499) |
| wavelength | the distance between a point on one wave and teh identical point on the next wave (499) |
| amplitude | the distance from the crest (or trough) of a wave to the rest position of the medium (499) |
| frequency | the number of wave crests that pass one place each second (499) |
| compressional wave | matter vibrates in the same direction as the wave travels (505) |
| pitch | the highness or lowness of a sound (508) |
| intensity | the amount of energy in each wave (510) |
| loudness | the human perceptin of sound intensity (510) |
| ultrasonic technology | used for a variety of purposes with sound frequencies greater than 20,000 Hz (514) |
| music | pitches following a regular pattern (516) |
| noise | pitches that have no set pattern (516) |
| resonance | sound vibration (517) |
| quality | the differnece among sounds of the same pitch and loudness (517) |
| interference | the ability of two or more waves to combine and form a new wave (519) |
| reverberation | the effect procued by many reflections of sounds (520) |
| acoustics | the study of sound (520) |
