| A | B |
|---|
| auricle | outer, fleshy part of the human ear |
| human frequency hearing | 20 - 20,000 hertz |
| infrasonic | frequencies below 20 hertz, such as thunder |
| ultrasonic | frequencies above 20,000 hertz, such as used in ultrasound equipment |
| human frequency voice range | 250 - 2,000 hertz |
| pitch | the "highness" or "lowness" of sound |
| intensity | measure of the amount of energy in a wave (its loudness) |
| loudness | human perception of intensity |
| sonogram | graphical representation of sound |
| Doppler Effect | the increase/decrease of wave frequency due to motion by its source or by the observer; results in higher pitch closer to source |
| noise | sound in which there is no set pattern or pitch |
| white noise | sound where there is an equal mixture of all frequencies |
| music | sound which follows a regular pattern and uses specific pitches and sound quality |
| sound quality | the differences among sounds of the same pitch and loudness; caused by the unique characteristics of whatever is producing the sound (ex. - "A" note on a piano versus a flute |
| fundamental frequency | the first harmonic |
| beat | interference of 2 sound waves with only slightly different frequencies where loud and silent alternate rapidly |
| echo | caused by reverberation |
| reverberation | reflections of sound waves off objects |
| acoustics | the study of sound |
| decibel | standard unit for intensity (dB) |
| vocal chords | vibrate due to compressions caused by expeling air as you talk and produce sound |
| resonance | vibration of an instrument at the same frequency as the original sound; 1st harmonic; produces a tone |
