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Light Bulb Light Bulb
Light Bulb Background From the earliest periods of history until the beginning of the 19th century, fire was man's primary source of light. This light was produced through different means—torches, candles, oil and gas lamps. Besides the danger presented by an open... Read more
electric light electric light
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Arc Light Arc Light
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light pen light pen
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aureole aureole
aureole , in physics, luminous circle seen when the sun or other bright light is observed through a diffuse medium, i.e., smoke, thin cloud, fog, haze, or mist. It sometimes occurs as a series of concentric circles. The aureole results from the dispersion of light by particles of dust or water.... Read more
photoelectric effect photoelectric effect
photoelectric effect emission of electrons by substances, especially metals, when light falls on their surfaces. The effect was discovered by H. R. Hertz in 1887. The failure of the classical theory of electromagnetic radiation to explain it helped lead to the development of the quantum theory .... Read more
absorption spectrum absorption spectrum
absorption spectrum A graph that shows the percentage of each wavelength of light absorbed by a pigment (e.g. chlorophyll, which absorbs mainly in the red and blue parts of the spectrum).... Read more
photoelectric cell photoelectric cell
photoelectric cell or photocell, device whose electrical characteristics (e.g., current, voltage, or resistance) vary when light is incident upon it. The most common type consists of two electrodes separated by a light-sensitive semiconductor material. A battery or other voltage source... Read more
optics optics
optics scientific study of light . Physical optics is concerned with the genesis, nature, and properties of light; physiological optics with the part light plays in vision ; and geometrical optics with the reflection and refraction of light as encountered in the study of the mirror and the ... Read more
stroboscope stroboscope
stroboscope , optical instrument for making a moving object appear to be slowed down or stationary. This effect is created by interrupting the observer's view so that the object is seen only at regularly spaced intervals rather than continuously. In its simplest form the stroboscope is a rotating... Read more

Related newspaper, magazine, and trade journal articles from HighBeam Research

Survey shows hvac contractors need to promote their services. (Service...
Magazine article from: Air Conditioning, Heating & Refrigeration News ...convention Survey shows hvac contractors...independent survey conducted...included a survey of 1,850...acquisitions, leveraged buyouts." Other...Studies show that the...viewed as a positive ...

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