| A | B |
|---|
| vibration | a back-and-forth motion of matter |
| sound wave | a vibration that carries energy and spreads away from a vibrating object |
| compression | the part of a sound wave where molecules are pushed together |
| rarefaction | the part of a sound wave where molecules are spread apart |
| pitch | how high or low a sound is |
| frequency | the number of times an object vibrates per second |
| volume | the loudness or softness of a sound |
| reflection | the bouncing of a sound wave off a surface |
| absorption | the disappearance of a sound wave into a surface |
| echo | a reflected sound wave |
| echolocation | finding an object by using reflected sound |
| Doppler effect | the change in frequency (and pitch) as a source of sound moves toward or away from you |
| amplitude | the energy in a sound wave |
| high pitch sound (high frequency) |  |
| low pitch sound(low frequency) |  |
| soft sound(less energy) |  |
| loud sound (more energy) |  |
| compression |  |
| rarefaction |  |
| crest |  |
| trough |  |
| wavelength |  |
| wave-height |  |
