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Light exerts physical pressure on objects in its path, a phenomenon which can be deduced by Maxwell's equations, but can be more easily explained by the particle nature of light: photons strike and transfer their momentum. Light pressure is equal to the power of the light beam divided by c, the speed of light.
Flags of white, red and blue stripes (bands) are closely associated with independence and the French Revolution. It can often signal the relationships of some nations with other nations (for instance, the flag of the Netherlands and flags of its former colonies).
The most common synthetic food coloring today is Allura Red AC, a red azo dye that goes by several names including: Allura Red, Food Red 17, C.I. 16035, FD&C Red 40, [25] [26] It was originally manufactured from coal tar, but now is mostly made from petroleum.
Artist's impression of Earth in the early Archean with a purplish hydrosphere and coastal regions Purple culture of Haloarchaea (left) and isolated purple and red membrane components (right) The Purple Earth Hypothesis (PEH) is an astrobiological hypothesis, first proposed by molecular biologist Shiladitya DasSarma in 2007, [1] that the ...
Far-red light is a range of light at the extreme red end of the visible spectrum, just before infrared light. Usually regarded as the region between 700 and 750 nm wavelength , it is dimly visible to human eyes.
Purple is one of the least used colors in vexillology and heraldry.Currently, the color appears in only five national flags: that of Dominica, Spain, El Salvador, Nicaragua, and Mexico, and one co-official national flag, the Wiphala (co-official national flag of Bolivia).
An example of this phenomenon is when clean air scatters blue light more than red light, and so the midday sky appears blue (apart from the area around the Sun which appears white because the light is not scattered as much). The optical window is also referred to as the "visible window" because it overlaps the human visible response spectrum.
In this case, pigment particles simply reflect whatever light hits the outer paint surface, where both blue and yellow light gets reflected and averaged together. Halftone printing uses non-opaque inks, such that the light transmits once through the ink, reflects off the white substrate (e.g. paper) and transmits a second time through the ink.
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