Size of what, then? Its not a particle. Having internal structure doesn't mean volume makes sense. You're right that distances do make sense, and he probably meant the electron has no known internal structure. But I don't know how you'd talk about size unless you mean a zone of probability of where it is.
It is a particle. With a wavefunction. HN isn't the best place to teach quantum mechanics, but suffice it to say that the notion of spatial wavefunction spread is completely separate from the idea of particle being point-like vs. having internal structure of significant volume.
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Size of what, then? Its not a particle. Having internal structure doesn't mean volume makes sense. You're right that distances do make sense, and he probably meant the electron has no known internal structure. But I don't know how you'd talk about size unless you mean a zone of probability of where it is.
It is a particle. With a wavefunction. HN isn't the best place to teach quantum mechanics, but suffice it to say that the notion of spatial wavefunction spread is completely separate from the idea of particle being point-like vs. having internal structure of significant volume.
It is a particle, just because it has a wavelength doesn't mean it's not a particle.
An elephant has a wavelength it's just that it's rather small compared to the elephant
Indeed. See De Broglie's equations.
http://en.wikipedia.org/wiki/Matter_wave