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Exposure is a combination of the length of time and the illuminance at the photosensitive material. Exposure time is controlled in a camera by shutter speed, and the illuminance depends on the lens aperture and the scene luminance. Slower shutter speeds (exposing the medium for a longer period of time), greater lens apertures (admitting more ...
On early 20th century and older orthochromatic (blue-sensitive) photographic film, the relative brightnesses of the blue supergiant Rigel and the red supergiant Betelgeuse irregular variable star (at maximum) are reversed compared to what human eyes perceive, because this archaic film is more sensitive to blue light than it is to red light.
Cherenkov radiation glowing in the core of the Advanced Test Reactor at Idaho National Laboratory. Cherenkov radiation (/ tʃ ə ˈ r ɛ ŋ k ɒ f / [1]) (also known as Čerenkov or Cerenkov radiation [2]) is electromagnetic radiation emitted when a charged particle (such as an electron) passes through a dielectric medium (such as distilled water) at a speed greater than the phase velocity ...
The result is an insoluble, blue pigment (ferric ferrocyanide) known as Prussian blue. [22] The exposure time varies widely, from a few seconds in strong direct sunlight, to 10–20 minute exposures on a dull day. After exposure, the paper is developed by washing in cold running water: the water-soluble iron(III) salts are washed away. The ...
Ultraviolet light therapy or ultraviolet phototherapy is a treatment ... Typical treatment regimens involve short exposure to UVB rays 3 to 5 times a week at a ...
Blue Sky DEF is made and distributed for retail sale by Prime Lubes, Inc. [6] Background. Diesel engines are typically operated with a lean burn air-to-fuel ratio ...
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