| 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 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. | |
| is a kind of photoelectric device | |
| instrument | has operator | |
| artifact | has creator | |
| has creation date | |
| has purpose | |
| has owner | |
| physical object | has location or center of gravity | |
| has angular momentum | |
| has mass | |
| has velocity | |
| has momentum | |
| has temperature | |
| has volume | |
| has extent | |
| has material | |
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