如图所示,在厚铅板A表面上放有一放射源M,它向各个方向射出相同速率的质量为m、电量为q的β粒子(重力可忽略不计).为了测出β粒子的射出速度,在金属网B与A板之间加电压U(A板电势低),发现荧
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![如图所示,在厚铅板A表面上放有一放射源M,它向各个方向射出相同速率的质量为m、电量为q的β粒子(重力可忽略不计).为了测出β粒子的射出速度,在金属网B与A板之间加电压U(A板电势低),发现荧](/uploads/image/z/9969980-68-0.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E5%9C%A8%E5%8E%9A%E9%93%85%E6%9D%BFA%E8%A1%A8%E9%9D%A2%E4%B8%8A%E6%94%BE%E6%9C%89%E4%B8%80%E6%94%BE%E5%B0%84%E6%BA%90M%2C%E5%AE%83%E5%90%91%E5%90%84%E4%B8%AA%E6%96%B9%E5%90%91%E5%B0%84%E5%87%BA%E7%9B%B8%E5%90%8C%E9%80%9F%E7%8E%87%E7%9A%84%E8%B4%A8%E9%87%8F%E4%B8%BAm%E3%80%81%E7%94%B5%E9%87%8F%E4%B8%BAq%E7%9A%84%CE%B2%E7%B2%92%E5%AD%90%28%E9%87%8D%E5%8A%9B%E5%8F%AF%E5%BF%BD%E7%95%A5%E4%B8%8D%E8%AE%A1%29.%E4%B8%BA%E4%BA%86%E6%B5%8B%E5%87%BA%CE%B2%E7%B2%92%E5%AD%90%E7%9A%84%E5%B0%84%E5%87%BA%E9%80%9F%E5%BA%A6%2C%E5%9C%A8%E9%87%91%E5%B1%9E%E7%BD%91B%E4%B8%8EA%E6%9D%BF%E4%B9%8B%E9%97%B4%E5%8A%A0%E7%94%B5%E5%8E%8BU%28A%E6%9D%BF%E7%94%B5%E5%8A%BF%E4%BD%8E%29%2C%E5%8F%91%E7%8E%B0%E8%8D%A7)
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