| A | B |
|---|
| reflection | the bouncing back of a wave after it strikes a barrier or an object |
| neon light | light emitted by atoms of certain gases, such as neon, when they absorb and then release energy |
| refraction | the bending of a wave as it passes at an angle from one medium to another |
| wave | a disturbance that transmits energy through matter or space |
| wave speed | the speed at which a wave travels |
| amplitude | the maximum distance a wave vibrates from its rest position |
| compression | the region of high density or pressure in a longitudinal wave |
| diffraction | the bending of waves around a barrier or through an opening |
| electromagnetic spectrum | the entire range of electromagnetic waves |
| fluorescent light | visible light emitted by a phosphor particle when it absorbs energy such as ultraviolet light |
| halogen light | a type of incandescent light |
| frequency | the number of waves produced in a given amount of time |
| electromagnetic wave | a wave that can travel through space or matter and consists of changing electric and magnetic fields |
| gamma rays | EM waves with very high energy |
| illuminated | the term that describes visible objects that are not a source of light |
| incandescent light | light produced by hot objects |
| infrared waves | EM waves that are between microwaves and visible light in the electromagnetic spectrum |
| luminous | the term describing objects that produce visible light |
| medium | the substance through which a wave can travel |
| microwaves | EM waves that are between radio waves and infrared waves in th electromagnetic spectrum |
| opaque | the term describing matter that does not transmit any light |
| pigment | a material that gives a substance its color by absorbing some colors of light and reflecting others |
| red | one of the primary colors of light |
| radio waves | EM waves having the longest wavelengths and the lowest frequencies |
| crest | the highest point of a transverse wave |
| scattering | the release of light energy by particles of matter that have absorbed energy |
| trough | the lowest point of a transverse wave |
| transparent | a term describing matter through which light is easily transmitted |
| x-rays | EM waves used to examine bones |
| visible light | the very narrow range of wavelengths and frequencies in the electromagnetic spectrum that humans can see |
| vapor light | light produced when electrons combine with gaseous metal atoms |
| ultraviolet light | Em waves that are between visible light and X-rays in the electromagnetic spectrum |
| translucent | the term describing matter that transmits light but also scatters the light as it passes through the matter |
| plane mirror | a mirror with a flat surface |
