ray (physics)

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ray

ray in physics, term denoting the straight line along which light or other form of radiation is propagated from its source. It generally refers to the line of propagation of waves but is also applied to streams of particles such as the electrons emitted from a cathode or particles emitted by substances exhibiting radioactivity . See cosmic rays ; X ray .

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"ray." The Columbia Encyclopedia, Sixth Edition. 2008. Encyclopedia.com. 11 Nov. 2009 <http://www.encyclopedia.com>.

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ray

A Dictionary of Biology | 2004 | Â© A Dictionary of Biology 2004, originally published by Oxford University Press 2004. (Hide copyright information) Copyright

ray
1. (in optics) A narrow beam of radiation.

2. (in botany) See medullary ray.

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The Concise Oxford Dictionary of English Etymology | 1996 | | Â© The Concise Oxford Dictionary of English Etymology 1996, originally published by Oxford University Press 1996. (Hide copyright information) Copyright

ray1 line of light XIV (various techn. senses from XVII). — (O)F. rai :- L. radius; see RADIUS.

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T. F. HOAD. "ray." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. 11 Nov. 2009 <http://www.encyclopedia.com>.

T. F. HOAD. "ray." The Concise Oxford Dictionary of English Etymology. 1996. Encyclopedia.com. (November 11, 2009). http://www.encyclopedia.com/doc/1O27-ray.html

T. F. HOAD. "ray." The Concise Oxford Dictionary of English Etymology. 1996. Retrieved November 11, 2009 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O27-ray.html

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