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Which of the following is true within an atom according to the passage? [br] The
Which of the following is true within an atom according to the passage? [br] The
游客
2024-02-19
27
管理
问题
Which of the following is true within an atom according to the passage? [br] The lightning-like spark is created by ______.
选项
A、the movement of the dome
B、the repelling between the collected electrons
C、the escaping of the electrons from the dome
D、the collection of many electrons on the dome
答案
C
解析
本题问“像闪电一样的光是……造成的”。根据lightning可定位到文章第三段第五句,此句之前是解释形成的原因。Van de Graaff发生器有一个发动机和橡胶带将电子置于一个钟形罩上,生成巨大的静电荷。由于相同电荷互相排斥,罩上集结的电子就互相排斥,在罩上的电子数过多时就会产生电子逃逸,形成像闪电一样的光。故[C]“电子由钟形罩上逃逸”正确。[A]“钟形罩的运动”。Van de Graaff发生器只是产生放电现象的仪器,其本身并不运动。所以不正确。[B]“集结电子的互相排斥”。电子相互排斥,但如果在罩上集结的电子数不够多,也不会产生逃逸现象,形成闪电。[D]“电子在钟形罩上的集结”。罩上集结的电子不产生逃逸现象,也不会形成闪电,所以也不是直接的原因,本项不够明确。
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