| 单词 | beta |
| 释义 | beta [`bād·ǝ] ASTRONOMY For dust grains ejected from the nucleus of a comet, the ratio of the radiation pressure force to the solar gravitational force. ELECTRONICS The current gain of a transistor that is connected as a grounded-emitter amplifier, expressed as the ratio of change in collector current to resulting change in base current, the collector voltage being constant. NUCLEONICS The amount of reactivity of a nuclear reactor corresponding to the delayed neutron fraction. PLASMA PHYSICS The ratio of the ion energy density of a plasma to its magnetic energy diversity,or of the particle pressure to the magnetic-field pressure. SCIENCE AND TECHNOLOGY The second letter of the Greek alphabet; β, B. |
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