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    Can anyone explain to me how stationary waves can be used to describe how electrons behave within atoms. I know i've been taught it but can't remember and can't find it in any books. Before tommorrow (exam) would be great!

    Thank in advance
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    please!!! surely someone knows!!
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    no1, at all knows? please...
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    stable electron orbits only exist where a whole number of electron wavelengths fit into the circumference of the orbit and form a stationary wave which does not radiate energy. in this model, the electrons have quantised angular momentum and energy can only be emitted and absorbed in discrete amounts.
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    thanks a lot!
    this explains shells etc!
    so i take it electron wavelengths = h/p
    is this actually on A level syllabus? cant remember
    cheers
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    yeah, wavelength = h/p. so for the allowed orbits:

    n*wavelength =2*pi*r r=radius or orbit
    nh/mv = 2*pi*r

    mvr (angular momentum) = nh/2*pi*r so angular momentum is quantised.

    i have no idea if this is on the a level syllabus, sorry.
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    ok well thank you so much, you're a great help!
 
 
 
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