| A | B |
|---|
| mechanical waves | created when a source of energy causes a vibration through a medium |
| crest | highest point of a wave |
| through | lowest point of a wave |
| transverse wave | wave that causes the medium to vibrate at RIGHT angles to direction in which waves travels |
| compression | area of where particles in a medium closely spaced together |
| rarefaction | area where particles are spread out |
| longitudinal wave | a wave in which the vibration of the medium is PARALLEL to the direction that wave travels |
| surface wave | a wave that travels ALONG the surface separating two media |
| periodic motion | any motion that repeats at regular time intervals |
| frequency | number of complete cycles per second |
| hertz | cycles per second |
| wavelength | distance between a point on one wave and he same point on the next cycle of the wave |
| speed of object | divide distance by time |
| speed of wave | wavelength times frequency |
| amplitude | maximum displacement of a medium from its rest position |
| reflection | occurs when a wave bounces off a surface that cannot be passed through |
| refraction | is the bending of a wave as it enters a new medium at an angle |
| refraction | bending of a wave as it moves around an obstacle or passes through a narrow opening |
| interference | when two or more waves overlap and combine together |
| constructive interference | two or more waves combine to produce a wave with a larger displacement |
| destructive interference | when two or more wave combine to produce a wave with a smaller displacements |
| standing wave | wave that appears to stay in one place |
