Definition - Constructivism. Definition of Constructivism. Constructivism is a theory of learning based on the idea that knowledge is constructed by the knower. based on mental activity. Learners are considered to be active organisms seeking meaning. Constructions of meaning may initially bear little relationship to reality (as in the naive theories of.
The visible spectrum is the portion of the electromagnetic spectrum that is visible to (can be detected by) the human eye. Electromagnetic radiation in this range of wavelengths is called visible light or simply light.
Electromagnetic radiation at wavelengths which the human eye can see, this radiation is perceived as colors ranging from red to violet. Microwaves Electromagnetic radiation which has a longer wavelength than visible light. Microwaves can be used to study the Universe, communicate with satellites in Earth orbit, and cook popcorn.