评论详情页
全部回复2 条回复
刘进平
赞
+1
赞
+1
Here's a question you've probably never considered: Why are all electrons the same? Every electron in the universe has exactly the same mass, exactly the same charge, and if you think about it, there's no reason why they'd have to be
http://www.popularmechanics.com/science/news/a27731/what-if-every-electron-was-the-same-electron/
Two particles can be distinguished if they have different properties such as charge, mass or spin. The particle that is known to have a mass equal to [math] 9.10938 \cdot 10^{-31} [/math] kg and a charge of [math] -1.60218 \cdot 10^{-19} [/math] C is called an electron. No other particle has the same set of properties. Electrons are elementary particles. As such, they have no internal structure. There haven't been observed any signs of such so far.
So, what would make two electrons distinguishable? Say, I pick one tennis ball and call it "A". Okay but if there are ten tennis balls in front of me and they are moving, I can't possibly follow which one is ball A. What could I do? I could put a sticker on my tennis ball, so that no matter where it goes, I would recognize it right away. So, can the same approach be applied to an electron? Even if we ignore physical inability to touch an electron, putting a sticker on one would mean that it already has an internal structure - there is now "particle+sticker". This means that it is no longer an elementary particle. So, distinguishing between electrons is impossible.
https://www.quora.com/Are-all-electrons-the-same
http://www.popularmechanics.com/science/news/a27731/what-if-every-electron-was-the-same-electron/
Two particles can be distinguished if they have different properties such as charge, mass or spin. The particle that is known to have a mass equal to [math] 9.10938 \cdot 10^{-31} [/math] kg and a charge of [math] -1.60218 \cdot 10^{-19} [/math] C is called an electron. No other particle has the same set of properties. Electrons are elementary particles. As such, they have no internal structure. There haven't been observed any signs of such so far.
So, what would make two electrons distinguishable? Say, I pick one tennis ball and call it "A". Okay but if there are ten tennis balls in front of me and they are moving, I can't possibly follow which one is ball A. What could I do? I could put a sticker on my tennis ball, so that no matter where it goes, I would recognize it right away. So, can the same approach be applied to an electron? Even if we ignore physical inability to touch an electron, putting a sticker on one would mean that it already has an internal structure - there is now "particle+sticker". This means that it is no longer an elementary particle. So, distinguishing between electrons is impossible.
https://www.quora.com/Are-all-electrons-the-same
08-13 11:21
