Light is a primary tool for perceiving the world and interacting with it for many organisms. Light from the Sun warms the Earth, drives global weather patterns, and initiates the life-sustaining process of photosynthesis; about 10 22 joules of solar radiant energy reach Earth each day. Light’s interactions with matter have also helped shape the structure of the universe.
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1. a. : something that makes vision possible. b. : the sensation aroused by stimulation of the visual sense organs. c. : electromagnetic radiation of any wavelength (as infrared, visible, ultraviolet, …
Light is a kind of wave, somewhat like ocean waves or sound waves. Waves carry energy from one place to another. But light waves don’t need water or air or anything to travel. They can move even in empty space (unlike sound waves). Light waves are made of a mixture of electricity and magnetism so they are called electromagnetic waves.
Light or visible light is electromagnetic radiation that can be perceived by the human eye. Visible light is usually defined as having wavelengths in the range of 400–700 nanometres (nm), corresponding to frequencies of 750–420 terahertz, between the infrared (with longer wavelengths) and the ultraviolet (with shorter wavelengths).
having light or illumination; bright; well-lighted: the lightest room in the entire house. pale, whitish, or not deep or dark in color: a light blue. verb (used with object), light·ed or lit, light·ing. to set …
light 1 of 5 noun 1 as in glow the steady giving off of the form of radiation that makes vision possible he read poetry to her by the light of the moon Synonyms & Similar Words Relevance glow glare illumination gleam sunlight beam glint luminescence shine radiance fluorescence incandescence ray glimmer flash moonlight blaze twinkle flare reflection
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Light from Alpha Centauri, which is the nearest star system to our own, requires roughly 4.3 years to get here, so Alpha Centauri is 4.3 light-years away. says on its website (opens in new tab
These rechargeable light bulbs are equivalent to a strong 60-watt bulb, so they emit a wide spectrum of light from stark brightness to warm dim mood lighting. Each bulb has three brightness levels and lasts up to 12 hours on a single chare if kept constantly lit. Use it as a light source for overhead lighting, floor lamps, wall sconces, table