| A | B |
|---|
| Acoustics | The study of sound |
| Audio Spectrum | range of sounds humans can hear |
| Sonic Spectrum | range of frequencies where longitudinal waves occur |
| Frequency | number of vibrations per second |
| Period | Time needed to complete one vibration |
| Fundamental | lowest natural frequency of vibration |
| Infrasonic | below the range of human hearing |
| Ultrasonic | above the range of human hearing |
| Intensity | rate of sound wave energy per unit area |
| Longitudinal | Sound is this type of wave |
| Loudness | our perception of a sounds intensity |
| Pitch | our perception of frequency |
| Timbre | quality of sound that depends on harmonics produced |
| 20 dB | relative intensity of a whisper |
| 60 dB | relative intensity of normal conversation |
| 80 dB | relative intensity of a hair dryer |
| 110 dB | relative intensity of a rock concert |
| 10^-12 W/m^2 | threshold of hearing |
| echo | reflection of a sound wave |
| 1 W/m^2 | threshold of pain |
