gamma ray | has frequency 3 EHz or more | ![2001-09-27 09:28:08.0 2001-09-27 09:28:08.0](facet.gif) |
has wavelength 100 pm or less | ![2001-09-27 09:28:08.0 2001-09-27 09:28:08.0](facet.gif) |
has definition Electromagnetic radiation similar to X-radiation, although of shorter wavelength, emitted spontaneously by some radioactive substances from atomic nuclei during radioactive decay. | ![has source: Abbot, D. 1984 Astronomers, Peter Bedrick Books, New York, 2001-09-27 09:28:08.0 has source: Abbot, D. 1984 Astronomers, Peter Bedrick Books, New York, 2001-09-27 09:28:08.0](facet.gif) |
has definition An electromagnetic wave with a wavelength in the range of 10-13 to 10-10 meter, corresponding to photons with energy in the range of 104 to 107 electron volts. | ![has source: Guth, A.H. 1997 The Inflationary Universe, Addison-Wesley, 2001-09-27 09:28:08.0 has source: Guth, A.H. 1997 The Inflationary Universe, Addison-Wesley, 2001-09-27 09:28:08.0](facet.gif) |
has definition Electromagnetic radiation with a wavelength less than about 1 Å (10-10 m); blends from the "hard" X-ray region. Photons of energy greater than about 10 keV. | ![has source: McLean, I.S. 1997 Electronic Imaging in Astronomy, Wiley, 2001-09-27 09:28:08.0 has source: McLean, I.S. 1997 Electronic Imaging in Astronomy, Wiley, 2001-09-27 09:28:08.0](facet.gif) |
has definition Rays first discovered in radioactive material, and later identified as very high energy photons. | ![has source: Coughlan, G.D., Dodd, J.E. 1999 The Ideas of Particle Physics, Cambridge University Press, 2001-09-27 09:28:08.0 has source: Coughlan, G.D., Dodd, J.E. 1999 The Ideas of Particle Physics, Cambridge University Press, 2001-09-27 09:28:08.0](facet.gif) |
has definition Extremely short-wavelength electromagnetic energy. | ![has source: Ferris, T. 1988 Coming of Age in the Milky Way, Morrow, 2001-09-27 09:28:08.0 has source: Ferris, T. 1988 Coming of Age in the Milky Way, Morrow, 2001-09-27 09:28:08.0](facet.gif) |
has definition Photons of very high frequency and very short wavelength; the most energetic and penetrating form of electromagnetic radiation. | ![has source: Silk, J. 1990 The Big Bang, W. H. Publishers, New York, 2001-09-27 09:28:08.0 has source: Silk, J. 1990 The Big Bang, W. H. Publishers, New York, 2001-09-27 09:28:08.0](facet.gif) |
has definition Photon of very high frequency (wavelength shorter than a few tenths of an angstrom); the most energetic form of electromagnetic radiation, although there is no sharp boundary between γ-ray photon and an X-ray photon. Usually γ-ray photons come from the nucleus and X-ray photons come from the inner orbital electrons. Galactic γ-ray photons seem to originate primarily in the spiral arms. | ![has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press*, 2001-09-27 09:28:08.0 has source: Hopkins, J. 1976 Glossary of Astronomy and Astrophysics, University of Chicago Press*, 2001-09-27 09:28:08.0](facet.gif) |
is a kind of photon | ![2001-09-27 09:28:08.0 2001-09-27 09:28:08.0](facet.gif) |
photon | has spin 1 | ![2001-09-27 09:28:08.0 2001-09-27 09:28:08.0](facet.gif) |
has synonym electromagnetic radiation | ![2001-09-27 09:28:08.0 2001-09-27 09:28:08.0](facet.gif) |
carries the force electromagnetism | ![2001-09-27 09:28:08.0 2001-09-27 09:28:08.0](facet.gif) |
massless particle | has mass 0 | ![2001-09-27 09:28:02.0 2001-09-27 09:28:02.0](facet.gif) |
neutral particle | is not accelerated by electric or magnetic fields | ![2001-09-27 09:28:02.0 2001-09-27 09:28:02.0](facet.gif) |
has charge 0 | ![2001-09-27 09:28:02.0 2001-09-27 09:28:02.0](facet.gif) |
wave | has propagation direction | ![2001-09-27 09:29:53.0 2001-09-27 09:29:53.0](facet.gif) |
particle | obeys uncertainty principle | ![2001-09-27 09:28:02.0 2001-09-27 09:28:02.0](facet.gif) |
boson | has quantum behavior Bose-Einstein statistics | ![2001-09-27 09:28:07.0 2001-09-27 09:28:07.0](facet.gif) |
harmonic motion | has amplitude | ![2001-09-27 09:29:52.0 2001-09-27 09:29:52.0](facet.gif) |
has period | ![2001-09-27 09:29:52.0 2001-09-27 09:29:52.0](facet.gif) |
physical process | has domain physics | ![2001-09-27 09:29:38.0 2001-09-27 09:29:38.0](facet.gif) |
physical object | has location or center of gravity | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |
has angular momentum | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |
has velocity | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |
has momentum | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |
has temperature | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |
has volume | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |
has extent | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |
has material | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |