| A | B |
|---|
| vibration | rapid back and forth movement |
| sound wave | a longitudinal (compressional) wave produced by vibrations. |
| rarefaction | A part of a longitudinal wave where the particles are spread apart. |
| compression | A part of a longitudinal wave where the particles are crowded together. |
| speed of sound | depends only on the medium in which the sound is traveling: air- fast, liquid -faster, solids - fastest. |
| pitch | a quality of sound determined by its frequency. |
| Doppler Effect | A change in wave frequency caused by the motion of the wave sound source or the movement of the observer. |
| loudness | the intensity of sound; loud sounds produce sound waves with a large amplitude. |
| decibel | the unit of measure for the volume or loudness of sound. |
| echo | a reflected sound wave |
| sonic boom | is the explosive sound heard when a shock wave reaches your ears. |
