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Unformatted text preview: 74. (a) Since px = py = 0, ∆px = ∆py = 0. Thus from Eq. 3920 both ∆x and ∆y are inﬁnite. It is
therefore impossible to assign a y or z coordinate to the position of an electron.
(b) Since it is independent of y and z the wave function Ψ(x) should describe a plane wave that
extends inﬁnitely in both the y and z directions. Also from Fig. 3911 we see that Ψ(x)2 extends
inﬁnitely along the x axis. Thus the matter wave described by Ψ(x) extends throughout the entire
threedimensional space. ...
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 Fall '08
 SPRUNGER
 Physics

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