| A | B |
|---|
| Hertz | The unit for measuring frequency. |
| Reflection | An echo is caused by a ________. |
| Vibration | A sound starts with _______. |
| Decibel | A unit that measures loudness. |
| Quality | Overtones affect the _______ of a sound. |
| Vibration | A sound travels as a(n)________. |
| Echo | A reflected sound is called a(n)_________. |
| Absorption | Sound tends not to bounce off carpets because of __________. |
| Compression | When molecules bunch together, that's the _________ stage of a sound wave. |
| Rarefaction | When molecules spread apart, that's the ________ stage of a sound wave. |
