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Light orÂ visible light is the portion ofÂ electromagnetic radiation that isÂ visible to theÂ human eye, responsible for the sense ofÂ sight. Visible light has aÂ wavelength in a range from about 380 or 400Â nanometres to about 760 or 780Â nm,Â with a frequency range of about 405 THz to 790 THz. InÂ physics, the termÂ light often comprises the adjacent radiation regions ofÂ infrared (at lower...read more
Color orÂ colour is theÂ visual perceptual property corresponding inÂ humans to the categories calledÂ red,green,Â blue and others. Color derives from theÂ spectrum of light (distribution ofÂ light energy versusÂ wavelength) interacting in the eye with the spectral sensitivities of theÂ light receptors.Â Color categories and physical specifications of color are also associated with objects,...read more
AÂ light-emitting diode (LED) is aÂ semiconductor light source. LEDs are used as indicator lamps in many devices and are increasingly used for otherÂ lighting. Introduced as a practical electronic component in 1962,Â early LEDs emitted low-intensity red light, but modern versions are available across theÂ visible,Â ultraviolet andÂ infrared wavelengths, with very high brightness. When a...read more
Photon diffusion is a situation whereÂ photons travel through a material without being absorbed, but rather undergoing repeatedÂ scattering events which change the direction of their path. The path of any given photon is then effectively aÂ random walk. A largeÂ ensemble of such photons can be said to exhibitÂ diffusion in the material, and can be described with aÂ diffusion equation.read more
SoundÂ is aÂ mechanical waveÂ that is anÂ oscillationÂ ofÂ pressureÂ transmitted through aÂ solid,Â liquid, orÂ gas, composed ofÂ frequenciesÂ within the range of hearing and of aÂ level sufficiently strongÂ to be heard, or the sensation stimulated in organs of hearing by such vibrations. Sound is a sequence of waves of pressure that propagates through compressible media such as air or...read more