Re: What keeps electrons spinning around their nucleus?

From: Tom Capizzi (etianshrdlu_at_verizon.net)
Date: 03/30/05 

Date: Wed, 30 Mar 2005 01:09:19 GMT

"Puppet_Sock" <puppet_sock@hotmail.com> wrote in message
news:1112140306.287685.147910@z14g2000cwz.googlegroups.com...
> Tom Capizzi wrote:
>> <puppet_sock@hotmail.com> wrote in message
>> news:c7976c46.0503291409.5e027614@posting.google.com...
>> > dubious@radioactivex.lebesque-al.net (Bilge) wrote in message
>> > news:<slrnd4dc08.n0h.dubious@radioactivex.lebesque-al.net>...
>> >> Nick:
>> >> >What is the velocity of an electron in a shell?
>> >>
>> >> Velocity isn't a quantum mechanical observable.
>> >
>> > Of course it is. What ever do you think you get when you take
>> > the time derivative of position?
>>
>> Electrons don't really have position. They have complex probability
>> amplitudes.
>> What do you get when you take the derivative of that?
>
> Come on. Review your QM. Position is an observable.
> Velocity is the time deriv of position. "Don't really
> have" isn't a sensible statement. What they have is
> expectation values, Eigen values, etc.
>

And Heisenberg says you can measure one or the other, but not both
simultaneously with certainty. In any case, tell me how you can tell the
position of an electron in an orbital.

> So it is perfectly sensible to ask such questions as
> "if I measure the position of an electron, what is the
> expected value, and what is the distribution?"
>
> Or "if I measure the value now, or in ten minutes,
> will I get the same result?"
> Socks
>

Relevant Pages

  • Re: electron
    ... > patrick wrote: ... What line of reasoning does he use in the calculation? ... > If yes, that's the expectation value of x, in general written as. ... the expectation value of the position of the electron does not depend ...
    (sci.physics)
  • Re: electron
    ... In Beiser Concepts of Modern Physics is done a calculation for the electron in Hydrogen atom. ... quatum state does not radiate. ... quantum-mechanical objects merely from the knowledge of an expectation value. ... And a time-independent average does not necessarily imply that the individual measurements over which was averaged are also independent ...
    (sci.physics)
  • Re: Does element mass = # of electron + neucleons??
    ... the atom as a whole, one obtains different positions (except possibly ... Here's an attempt to define "move" classically: as the electron is both ... Perhaps this meaning will do: the electron "moves" if the expectation ...
    (sci.physics.relativity)
  • Re: What keeps electrons spinning around their nucleus?
    ... They have complex probability ... >> amplitudes. ... > expectation values, Eigen values, etc. ... position of an electron in an orbital. ...
    (sci.physics)