Light Vocabulary Unit C Pages 73-99

Visible Light (84, C) The part of the EM spectrum that the human eye can see.

EM Wave (73, C) An electromagnetic wave is a disturbance that transfers energy through a field.

Prism (97, C) A tool that uses refraction to separate the different wavelengths that make up white light.

Primary Colors (98, C) (Red, Green, and Blue) Three colors of light, which can be mixed to produce all possible colors. When all three are mixed together equally, they appear white or colorless.

Infrared Light (84, C) EM frequencies between microwaves and visible light. It is often associated with heat/cooking. Example: in a toaster

Microwaves (83, C) EM waves with shorter wavelengths, higher frequencies, and higher energy then other radio waves. These waves are used in cell phones.

EM Spectrum (80, C) The electromagnetic spectrum is a gradual progression from the lowest frequencies (radio waves), to the highest (gamma rays).

Radio Waves (82, C) EM waves that have the longest wavelengths, the lowest frequencies, and the lowest energies. These waves broadcast TV.

X-Rays (86, C) X-rays pass easily through the soft tissues of the body, but many are filtered out by denser matter such as bone.

Transmission (93, C) The passage of an EM wave through the medium (any object a wave goes through).

Absorption (93, C) The disappearance of an EM wave into the medium (any object a wave goes through).

Ultraviolet or UV Light (85, C) Part of the EM spectrum consists of frequencies above those of visible light and below those of x-rays. They can damage tissue, skin, and your eyes.

Scattering (95, C) Spreading out of light rays in all directions, because particles reflect and absorb light.

Incandescence (89, C) The production of light by materials at high temperatures. When a material gets hot enough, it gives off light by glowing or bursting into flames.

Bioluminescence (89, C) The production of light by living organisms. These organisms produce light from chemical reactions rather than intense heat.