本题目来源于试卷: Molecules and Solids，类别为 IB物理学
[问答题]
If conduction electrons are free to r a;usje6bz5wwn 0+0 qdi;f.kd oam (vb 7am-.sj nahy9m mms8(yw1 about in a metal, why don't they leave t7havm1m( s jaw(.9-y s8bymnmhe metal entirely?
参考答案:
The freely roaming electrons in a metal are not completely free. They are still attracted to the positive nuclei in the metal, so they would need extra energy from outside the metal to be able to leave the metal. For example, in the photoelectron effect, a photon comes in and strikes an electron to knock it out of the metal. In general, a metal is neutral, so if one electron were to move away from the metal, then the metal would be positively charged and the electron would be attracted back to the metal.
本题详细解析:
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