| 单词 | cathode rays |
| 释义 | cathode rays Streams of electrons emitted at the cathode in an evacuated tube containing a cathode and an anode. They were first observed in gas discharge tubes operated at low pressure. Under suitable conditions electrons produced by secondary emission at the cathode are accelerated down the tube to the anode. In such devices as the cathode-ray tube the electrons are produced by thermionic emission from a hot cathode in a vacuum |
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