如图所示,热电子有阴极飞出时的初速度忽略不计,电子发射装置的加速电压为U..电容器板长和板间距离均为L=10cm,下级板接地.电容器右端到荧光屏的距离也是L=10cm.在电容器两极板间接一交变
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![如图所示,热电子有阴极飞出时的初速度忽略不计,电子发射装置的加速电压为U..电容器板长和板间距离均为L=10cm,下级板接地.电容器右端到荧光屏的距离也是L=10cm.在电容器两极板间接一交变](/uploads/image/z/11325834-18-4.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E7%83%AD%E7%94%B5%E5%AD%90%E6%9C%89%E9%98%B4%E6%9E%81%E9%A3%9E%E5%87%BA%E6%97%B6%E7%9A%84%E5%88%9D%E9%80%9F%E5%BA%A6%E5%BF%BD%E7%95%A5%E4%B8%8D%E8%AE%A1%2C%E7%94%B5%E5%AD%90%E5%8F%91%E5%B0%84%E8%A3%85%E7%BD%AE%E7%9A%84%E5%8A%A0%E9%80%9F%E7%94%B5%E5%8E%8B%E4%B8%BAU..%E7%94%B5%E5%AE%B9%E5%99%A8%E6%9D%BF%E9%95%BF%E5%92%8C%E6%9D%BF%E9%97%B4%E8%B7%9D%E7%A6%BB%E5%9D%87%E4%B8%BAL%3D10cm%2C%E4%B8%8B%E7%BA%A7%E6%9D%BF%E6%8E%A5%E5%9C%B0.%E7%94%B5%E5%AE%B9%E5%99%A8%E5%8F%B3%E7%AB%AF%E5%88%B0%E8%8D%A7%E5%85%89%E5%B1%8F%E7%9A%84%E8%B7%9D%E7%A6%BB%E4%B9%9F%E6%98%AFL%3D10cm.%E5%9C%A8%E7%94%B5%E5%AE%B9%E5%99%A8%E4%B8%A4%E6%9E%81%E6%9D%BF%E9%97%B4%E6%8E%A5%E4%B8%80%E4%BA%A4%E5%8F%98)
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