| A | B |
|---|
| amplitude | how big a sound wave is |
| decibel | unit for loudness |
| vacuum | sound can't travel through this |
| speed | distance divided by time |
| vibration | this causes sound |
| frequency | another word for pitch |
| Hertz | unit for frequency |
| metre per second | unit for speed |
| 140 db | Painful sound level |
| bat | animal that can hear very high frequencies |
| Loudspeaker | used in a hi- fi to make sound |
| voicebox | larynx |
| instrument that produce a low note | double bass |
| insterument that produces a high note | viola |
| 20KHZ | highest frequency that humands can normally hear |
| 40dB | loudness of a quiet conversation |
| 340 | speed of sound in metres per second |
| signal generator | scientific device used to make sound signals |
| Tuning fork | used to check piano tuning |
| 80dB | sound danger level |
