| gamma ray |
electromagnetic radiation of high energy and frequency, produced by reactions of radioactive atoms or by high energy electrons interacting with matter. |
| Hertzian wave |
an electromagnetic wave, such as a radio wave, produced when electricity is oscillated in a conductor. |
| inductor |
a device that generates an electromotive force in an electric circuit by electromagnetic induction; coil. [1/2 definitions] |
| infrared |
the invisible electromagnetic radiation next to and longer in wavelength than those of the visible red end of the spectrum. [1/2 definitions] |
| intensity |
in physics, degree of strength of energy, esp. electromagnetic energy. [1/4 definitions] |
| interference |
the combining of electromagnetic waves so that a disturbance is produced, such as an unclear radio signal. [1/4 definitions] |
| irradiation |
emission of electromagnetic radiation, or the state of being exposed to such radiation. [1/2 definitions] |
| light1 |
electromagnetic radiation, esp. from the sun, that enables one to see objects. [1/13 definitions] |
| long wave |
a low-frequency electromagnetic wave, usu. a radio wave that is longer than one thousand meters and below three hundred kilohertz in frequency. |
| maser |
a device that amplifies electromagnetic waves and concentrates them at a single microwave frequency (acronym for "microwave amplification by stimulated emission of radiation"). |
| mass spectrometer |
an instrument used to determine the mass and abundance of charged particles in a prepared beam, by passing it through an electromagnetic field and electronically recording the distribution of particles, often for the purpose of chemical analysis. |
| microwave |
any extremely high-frequency electromagnetic wave whose wavelength is between one millimeter and one meter. [1/2 definitions] |
| microwave oven |
an oven that cooks or heats food or beverages quickly using high-frequency electromagnetic radiation. |
| modulate |
to vary the frequency, amplitude, phase, or the like of (an electromagnetic wave). [2/6 definitions] |
| modulation |
variation of the frequency, amplitude, phase, or the like of an electromagnetic wave. [1/3 definitions] |
| photoelectron |
an electron whose emission from a substance is induced by the absorption of electromagnetic radiation such as visible light. |
| photoemission |
the emission of photoelectrons from a surface, esp. a metallic one, induced by the absorption of electromagnetic radiation such as visible light. |
| photomultiplier |
an electronic device that detects and amplifies electromagnetic radiation, esp. in the visible range; photomultiplier tube. |
| photomultiplier tube |
an electronic device that detects and amplifies electromagnetic radiation, esp. in the visible range; photomultiplier. |
| photon |
the fundamental unit of electromagnetic energy with zero mass, no electrical charge, and a spin of one, usu. regarded as an elementary particle. |
| pickup |
a device for receiving sound or electromagnetic waves. [1/5 definitions] |