| A | B |
|---|
| amplitude | the distance measured from the rest position of a wave straight upward to the crest |
| angle of incidence | angle at which a wave approaches a barrier |
| angle of reflection | angle at which a wave rebounds off a barrier |
| constructive interference | the action of two or more waves combininig to form a wave with amplitude greater than any of the single waves |
| crest | highest point of a transverse wave |
| destructive interference | the action of two or more waves combining to form a wave with an amplitude less than any single wave |
| diffraction | the bending of waves around the sides of a barrier |
| frequency | the number of waves that pass a point in one second |
| hertz | the unit used to measure frequency of a wave |
| law of reflection | principle that describes behavior of waves striking and rebounding from a barrier. |
| longitudinal wave | disturbance that moves a medium in the direction of the wave |
| medium | entity in which an object exists through which a wave can move. |
| reflection | rebound of a wave when it hits a barrier |
| refraction | a wave's change of direction when moving from one medium to another. |
| transverse wave | disturbance that moves the medium at right angles to the direction of the wave. |
| trough | lowest point of a transverse wave. |
| wave | disturbance that travels through matter or space, changing the matter in the process. |
| wavelength | distance between one point on a wave and the identical point on the next wave in a series. |
| decibel | a unit used to measure sound intensity level |
| echo | repetition of a sound caused by reflected sound |
| intensity | measurement of the rate at which sound energy enters the ear |
| loudness | perception of the rate at which sound energy enters the ear |
| pitch | perception of highness or lowness of sound. |
| sonar | system for gathering information by use of reflected sound waves |
| sound wave | longitudinal wave produced by a vibration |
| ultrasonic | sound waves that have a frequency of 20000 Hz or more; above human hearing |
| vibration | back and forth movement of matter |
