Radio Waves: Electromagnetic energy with frequencies in the 3000 hertz (3 kHz) to 300 billion Hertz (300 GHz) portion of the electromagnetic spectrum.

 

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Radio Waves: Electromagnetic energy with frequencies in the 3000 hertz (3 kHz) to 300 billion Hertz (300 GHz) portion of the electromagnetic spectrum.

Microwaves: A subset of radio waves that have frequencies ranging from around 300 million waves per second (300 MHz) to three billion waves per second (3 GHz).

Radiolaria: Protistan phylum, whose members are planktonic and secrete an often elaborate siliceous test

Radiolarian: A group of one-celled marine animals with a siliceous skeleton that occupies shallow portions of the water column. Radiolarians have a range from Cambrian to present.

Radioisotope: Term applied to a radioactive isotope, such as carbon-14 or uranium 238. Radioisotope nuclei are unstable and spontaneously breakdown and emit one of a number of types of radiation.

Radiocarbon Technique: The estimation of primary productivity by the measurement of radiocarbon uptake

Radioactive Decay: The spontaneous decay of an atom to an atom of a different element by emission of a particle from its nucleus (alpha and beta decay) or by electron capture.

American Federation Of Television And Radio Artists (AFTRA): An AFL-CIO union of broadcasting workers. Headquartered in N.Y., near the offices of the major networks, it is the primary organization of broadcast talent, with 30 locals. Performers who ap . . . View Full Definition

Radiolarian Ooze: A deep-sea pelagic sediment that contains at least 30% siliceous radiolarian remains.

Radiography: Technique of using x-rays, gamma rays and charged particles to form shadow images on photographic materials. Used in medical and industrial research because of its ability to penetrate opaqu . . . View Full Definition