Zume
Search results
light, That portion of the electromagnetic spectrum visible to the human eye. It ranges from the red end to the violet end of the spectrum, with wavelengths from 700 to 400 nanometres and frequencies from 4.3 × 10 14 to 7.5 × 10 14 Hz.
The visible spectrum is the band of the electromagnetic spectrum that is visible to the human eye. Electromagnetic radiation in this range of wavelengths is called visible light (or simply light).
The speed of light in vacuum, commonly denoted c, is a universal physical constant that is exactly equal to 299,792,458 metres per second (approximately 300,000 kilometres per second; 186,000 miles per second; 671 million miles per hour).
List of light sources - Wikipedia. Contents. hide. (Top) Incandescence. Combustion. Lamps. Other. Nuclear and high-energy particle. Celestial and atmospheric. Luminescence. Bioluminescence. Cathodoluminescence. Chemiluminescence. Cryoluminescence. Crystalloluminescence. Electric discharge (electrical energy) Electrochemiluminescence.
Visible spectrum - Simple English Wikipedia, the free encyclopedia. Contents. hide. Beginning. Color display spectrum. References. Visible spectrum. Electromagnetic Spectrum. The visible spectrum (or sometimes called the optical spectrum) is the part of the electromagnetic spectrum that is visible to the human eye.
A photon (from Ancient Greek φῶς, φωτός (phôs, phōtós) 'light') is an elementary particle that is a quantum of the electromagnetic field, including electromagnetic radiation such as light and radio waves, and the force carrier for the electromagnetic force.
The speed of light, in any medium, which is usually denoted by , is a physical constant important in many areas of physics. It is denoted by 'c^0' especially in vacuum medium, although the symbol 'c' can be used to refer to that in any medium. It is exactly 299,792,458 metres per second (983,571,056 feet per second) by definition.
