| A | B |
|---|
| Vibration | Rapid movement of an object up and down, or back and forth. |
| Sound Wave | The energy produced by a sound, which go outward as a wave in all directions- backward and forward, and is carried by the air |
| Compression Wave | longitudinal and pressed together |
| Rarefaction | space between compression waves |
| Cycles per second | The number of sound waves produced in one second. |
| High Sound | produce more waves that are closer together |
| Low Sound | produce fewer waves that are farther apart |
| Frequency | The number of cycles per second a sound produces |
| Hertz | The unit of measurement for frequency. |
| high pitched sounds | in bottle with the most liquid |
| lower pitched sound | in longer straw with lower frqeuncy |
| Pitch | The relative highness or lowness of a sound – determined by the frequency of the vibrating object. |
| Slower vibrations | = lower pitch |
| Amplitude | height of a sound wave |
| Amplify | to make louder |
| Timbre | unique characteristics of sound from its source |
| Echo | reflection of a sound wave off a surface |
| Echolocation | sound waves returning to an animal to find a found source or other animal |
| SONAR | sound waves used by humans to located things under water |
| Sound | form of energy produced and transmitted by vibrating matter |
| Resonance | enhancement of sound to make it be fuller (guitar) |
| Medium | sound waves travel through solids, liquids, and air |
| Vacuum | sound cannot travel because of no matter |
| Solid | sound waves travel more quickly when closer together |
| Volume | how loud or soft a sound |
| Decibels | Db - loudness of sound |
