| A | B |
|---|
| sound wave | moving vibrations of air molecules |
| echo | a reflected sound |
| Mach 1 | Going 340 meters/sec. which is faster than the speed of sound |
| supersonic speed | Traveling faster than the speed of sound |
| sonic boom | Large sounding boom created when an aircraft or bullet breaks the sound barrier. |
| infrasound | A low frequency sound below our hearing ability. |
| ultrasound | Too high a frequency for us to hear. |
| pitch | Describes the type frequency we are hearing. High frequency = high pitch |
| timbre | Sound quality created by a mixture of tones |
| Sonar | Sound Navigation and Ranging. The sending out and receiving back bounced off sound waves. |
| bioacoustics | Study of sound made by wildlife. |
