| A | B |
|---|
| wave | A disturbance that transfers energy from one plece to to another. |
| medium | A material through which a wave travels. |
| transverse wave | A wave in which the particles move perpendicularly to the direction the wave travels. |
| longitudinal wave | A wave in which the particles move back and forth in the same direction that the wave travels, or a parallel to the wave. |
| amplitude | The measure of how far particles in the medium move away from their normal rest position. For water it is the height of the crest |
| wavelength | The distance over which the wave's shape repeats. It is measured by the distance from one point on a wave to an identical point, EX Measure the distance from on e crest to another. |
| frequency | How many cycles occur in an amount of time. |
| wave speed | The speed at which a wave travels. |
| reflection | The bouncing of light off a surface. |
| refraction | The change in direction of a wave as it passes from one medium into another at an angle. |
| crests | The points wher the waves are the highest |
| troughts | The point where the waves are the lowest. |
| mechanical waves | Waves that require a medium. |
| electromagnetic waves | Disturbances in electric and magnectic field. they are considered transverse waves. Examples are visible light, radio waves, micro waves, ultraviolet (UV) light and x-rays. |
| wave period (period) | The time required for one cycle. You can measure the ________ by finding the time for one full pattern of a wave to pass a given point. |
| hertz | frequency is measured in ________> |
| inverse | frequency and period are closly related. Frequency is the __________of period |
| wavefronts | waves that spread out over more than one dimension. As the __________ moves farther from the source it becomes greater |
| radiation | The transfer of energy as electromagnetic waves. |
| electromagnetic (EM) spectrum | The light waves we see |
| infrared | (means below red) IR light has slightly longer wavelenghs than red light The amount of infrared light an object gives off depends on its temperature. |
| ultraviolet | UV light has slightly shorter wavelenghts than violet light. Means beyond violet. some animal can see ultra violet light. |
| transparent | matter that transmits light. EX air, water and some glass. |
| translucent | materials transmit light but do not let light travel straight through. the light is scattered into mant different directions. |
| opaque | A material that does not let any light through them. |
| absorption | The transfer of light energy to matter. |
| scattering | When light is sent in many different directions as it passes through a medium. |
