| A | B |
|---|
| infrasonic | frequencies below what humans can hear, such as thunder |
| ultrasonic | frequencies above what humans can hear, such as used in ultrasound equipment |
| pitch | the "highness" or "lowness" of sound |
| intensity | measure of the amount of energy in a wave |
| 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 |
| 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) |
