Physics
| 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 |
| Color |
(nm) |
(THz) |
(μm−1) |
(eV) |
(kJ mol−1) |
|---|---|---|---|---|---|
| Infrared | >1000 | <300 | <1.00 | <1.24 | <120 |
| Red | 700 | 428 | 1.43 | 1.77 | 171 |
| Orange | 620 | 484 | 1.61 | 2.00 | 193 |
| Yellow | 580 | 517 | 1.72 | 2.14 | 206 |
| Green | 530 | 566 | 1.89 | 2.34 | 226 |
| Blue | 470 | 638 | 2.13 | 2.64 | 254 |
| Violet | 420 | 714 | 2.38 | 2.95 | 285 |
| Near ultraviolet | 300 | 1000 | 3.33 | 4.15 | 400 |
| Far ultraviolet | <200 | >1500 | >5.00 | >6.20 | >598 |
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
Famous quotes containing the word physics:
“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 labor we delight in physics pain.”
—William Shakespeare (1564–1616)
“... 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 (1846–1923)