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v. t. e. Light, visible light, or visible radiation is electromagnetic radiation that can be perceived by the human eye. [ 1] Visible light spans the visible spectrum and is usually defined as having wavelengths in the range of 400–700 nanometres (nm), corresponding to frequencies of 750–420 terahertz. The visible band sits adjacent to the ...
The following list is meant to help you with your own research, by offering links to respectable information sources on the web, available free of charge.Inclusion on the list doesn't automatically mean the absolute truth is on these websites, so always be critical and compare information between different sources.
This is a list of sources of light, the visible part of the electromagnetic spectrum.Light sources produce photons from another energy source, such as heat, chemical reactions, or conversion of mass or a different frequency of electromagnetic energy, and include light bulbs and stars like the Sun. Reflectors (such as the moon, cat's eyes, and mirrors) do not actually produce the light that ...
The Information Age (also known as the Third Industrial Revolution, Computer Age, Digital Age, Silicon Age, New Media Age, Internet Age, or the Digital Revolution [1]) is a historical period that began in the mid-20th century. It is characterized by a rapid shift from traditional industries, as established during the Industrial Revolution, to ...
Information is an abstract concept that refers to something which has the power to inform. At the most fundamental level, it pertains to the interpretation (perhaps formally) of that which may be sensed, or their abstractions. Any natural process that is not completely random and any observable pattern in any medium can be said to convey some ...
Most light sources emit light at many different wavelengths; a source's spectrum is a distribution giving its intensity at each wavelength. Although the spectrum of light arriving at the eye from a given direction determines the color sensation in that direction, there are many more possible spectral combinations than color sensations.
Photography of Sierra Nevada. Photography is the art, application, and practice of creating images by recording light, either electronically by means of an image sensor, or chemically by means of a light-sensitive material such as photographic film. It is employed in many fields of science, manufacturing (e.g., photolithography ), and business ...
An Evergreen Protective Association volunteer recording an oral history at Greater Rosemont History Day. Oral history is the collection and study of historical information from people, families, important events, or everyday life using audiotapes, videotapes, or transcriptions of planned interviews. These interviews are conducted with people ...