photomultiplier | has definition Device used in photometry for the amplification of light by the release and acceleration of electrons from a sensitive surface. The result is a measurable electric current that is proportional to the intensity of received radiation. | ![has source: Abbot, D. 1984 Astronomers, Peter Bedrick Books, New York, 2001-09-27 09:27:35.0 has source: Abbot, D. 1984 Astronomers, Peter Bedrick Books, New York, 2001-09-27 09:27:35.0](facet.gif) |
has definition A vacuum encapsulated photocathode from which electrons are ejected by the photoelectric effect followed by multiple cathodes from which many additional electrons are emitted in a cascade. When finally collected, the original single electron may have generated a pulse of over one million electrons. | ![has source: McLean, I.S. 1997 Electronic Imaging in Astronomy, Wiley, 2001-09-27 09:27:35.0 has source: McLean, I.S. 1997 Electronic Imaging in Astronomy, Wiley, 2001-09-27 09:27:35.0](facet.gif) |
is a kind of photoelectric device | ![2001-09-27 09:27:35.0 2001-09-27 09:27:35.0](facet.gif) |
instrument | has operator | ![2001-09-27 09:27:28.0 2001-09-27 09:27:28.0](facet.gif) |
artifact | has creator | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |
has creation date | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |
has purpose | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](facet.gif) |
has owner | ![2001-09-27 09:27:27.0 2001-09-27 09:27:27.0](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 mass | ![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) |