| A | B |
|---|
| sound | the energy caused by an object's vibrations |
| decibel | unit for loudness |
| vibrate | to move back and forth quickly |
| matter | anything that has volume and mass |
| compressional wave | longitudinal wave for sound |
| compression | when air molecules are pushed together |
| rarefaction | when are particles are spread apart |
| echo | sound that bounces back from an object |
| intensity | strength of a sound |
| loudness | how loud or soft a sound is perceived to be |
| frequency | number of waves produced in a given amount of time |
| pitch | how high or low a sound is perceived to be |
| doppler effect | apparent change in pitch of a sound caused by motion of the listener or source of sound |
| noise | any undersired sound; random mix of pitches |
| sonic boom | explosive sound heard when shock wave from an object going faster than speed of sound reaches a person's ears |
| ultrasonic | sounds with frequencies higher than 20,000 Hz |
| quality | the difference in sound |
| wave length | distance between one point on a wave to another similar point on the next wave |
| supersonic | relating to a speed greater than speed on sound in air |
| wave | vibration that travels through a solid, liquid, or gas |
| molecules | all matter is made up of these small particles |
| sonar | device that uses sound waves to measure distance and to find objects under water |
| amplitude | energy needed to produce a louder sound |
