Absorption spectrum

... is a diagram depicting the wavelengths of electromagnetic radiation absorbed by a material, usually a gas ... Let us consider white light, which consists of electromagnetic radiation at all frequencies, passing through a ... not just in the direction in which the electromagnetic radiation was originally travelling. If the ...

Electrical energy

... Electrical energy or electromagnetic energy is a form of energy present in any ... or magnetic field , or in any volume containing electromagnetic radiation . The SI unit of electrical energy ... Electrical energy is also identical to the electromagnetic fields surrounding a transmission line , the ...

Photon

... ) is a quantum of excitation of the quantised electromagnetic field and is one of the elementary particles ... terms, photons are the building blocks of electromagnetic radiation : that is, a photon is a "particle" of ... denoted X , an X-ray ). Properties All electromagnetic radiation, from radio waves to gamma rays, is ...

Optical spectrum

... or visible spectrum ) is the portion of the electromagnetic spectrum that is visible to the human eye . ... of the " optical window ", the region of the electromagnetic spectrum which passes largely unattenuated ... red light, which is the reason the sky is blue). electromagnetic radiation outside the optical wavelength range is ...

Wavelength

... by the frequency of the wave. When dealing with electromagnetic radiation in a vacuum, this speed is the speed ... λ = wavelength of a sound wave or electromagnetic wave c = speed of light in vacuum = ... (in megahertz). When light waves (and other electromagnetic waves) enter a medium, their wavelength is ...

Potential energy

... elastic material forces the atoms very slightly further apart. Powerful electromagnetic forces try to keep the atoms at their optimal distance and so elastic potential is actually electromagnetic potential. Having said that, scientists rarely talk about forces on an ...

Chlorophyll

... and ultimately to convert carbon dioxide and water to carbohydrates and oxygen . Chlorophyll absorbs most in the red and blue portions of the electromagnetic spectrum , thus its intense green color. Chemical structure Chlorophyll is a chlorin pigment, which is structurally similar to porphyrin ...

Magnetic resonance imaging

... field or anti-parallel . While the proportion is nearly equal, slightly more are oriented parallel. The tissue is then briefly exposed to pulses of electromagnetic energy in a plane perpendicular to the magnetic field, causing some of the magnetically aligned hydrogen nuclei to assume a temporary non-aligned ...