|color||wavelength interval||frequency interval|
|red||~ 700–635 nm||~ 430–480 THz|
|orange||~ 635–590 nm||~ 480–510 THz|
|yellow||~ 590–560 nm||~ 510–540 THz|
|green||~ 560–490 nm||~ 540–610 THz|
|blue||~ 490–450 nm||~ 610–670 THz|
|violet||~ 450–400 nm||~ 670–750 THz|
Electromagnetic radiation is characterized by its wavelength (or frequency) and its intensity. When the wavelength is within the visible spectrum (the range of wavelengths humans can perceive, approximately from 390 nm to 750 nm), it is known as "visible light".
Most light sources emit light at many different wavelengths; a source's spectrum is a distribution giving its intensity at each wavelength. Although the spectrum of light arriving at the eye from a given direction determines the color sensation in that direction, there are many more possible spectral combinations than color sensations. In fact, one may formally define a color as a class of spectra that give rise to the same color sensation, although such classes would vary widely among different species, and to a lesser extent among individuals within the same species. In each such class the members are called metamers of the color in question.
Read more about this topic: Color
Other articles related to "physics":
... The Institute for Theoretical and Experimental Physics (ITEP Russian ... ITEP exists as a community of people studying topics ranging from theoretical physics and mathematics to biology and chemistry ... Research areas in theoretical physics concentrate around quantum field theory including the string theory ...
... In a non-tonal language, segments may be differentiated as follows Vowels are replaced by a set of relative pitch ranges generally tracking the f2 formant of spoken language ... Stress is expressed by higher pitch or increased length Consonants are produced by pitch transitions of different lengths and height, plus the presence or absence of occlusion ...
... Further information List of unsolved problems in physics Research in physics is continually progressing on a large number of fronts ... In condensed matter physics, an important unsolved theoretical problem is that of high-temperature superconductivity ... In particle physics, the first pieces of experimental evidence for physics beyond the Standard Model have begun to appear ...
... Information has a well-defined meaning in physics ... Bekenstein claimed that a growing trend in physics was to define the physical world as being made of information itself (and thus information is defined in this way) (see Digital physics) ...
... The idea that Newtonian physics proved causal determinism was highly influential in the early modern period ... For instance, Newtonian physics admits solutions where particles accelerate continuously, heading out towards infinity ...
Famous quotes containing the word physics:
“... it is as true in morals as in physics that all force is imperishable; therefore the consequences of a human action never cease.”
—Tennessee Claflin (18461923)
“But this invites the occult mind,
Cancels our physics with a sneer,
And spatters all we knew of denouement
Across the expedient and wicked stones.”
—Karl Shapiro (b. 1913)
“The fundamental laws of physics do not describe true facts about reality. Rendered as descriptions of facts, they are false; amended to be true, they lose their explanatory force.”
—Nancy Cartwright (b. 1945)