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Modern physics

  1. Apr 15, 2009 #1
    Why the rutherford atomic model can't explain the line spectra of the hydrogen atom?
     
  2. jcsd
  3. Apr 15, 2009 #2

    malawi_glenn

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    the most essential is that a spiralling charge will emit radiation and thus loose energy making the atom collapse.
     
  4. Apr 15, 2009 #3
    But,that only explains the unstability of atom.The question is about the spectra.
     
  5. Apr 15, 2009 #4

    malawi_glenn

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    if the atom is unstable, will there be a spectra? Well, it will be continuous -> compare with bremsstrahlung spectra.
     
  6. Apr 15, 2009 #5
    So,Can I say this-Because the atom is spiralling down towards the nucleus,it will continuoulsly be giving the radiation forming a single wavelength,continuous spectra.
     
  7. Apr 15, 2009 #6

    malawi_glenn

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    I would not say that it will forming a single wavelenght, that is a discrete spectrum. Your sentence is a self contradiction.
     
  8. Apr 15, 2009 #7
    So,how do I explain the reason then..........
     
  9. Apr 15, 2009 #8

    malawi_glenn

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    you just drop the "forming a single wavelength" part.
     
  10. Apr 15, 2009 #9
    How about this-Rutherford's model suggests that the electrons can float around at any energy level they want, and that photons of any frequency or wavelength can be emitted.
     
  11. Apr 15, 2009 #10

    malawi_glenn

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    no electrons can not float around as they want! The rutherford model is a classical, non-quantum, model where electrons are orbiting the nuclei as planets orbiting the sun.

    But the electrons are then under a radial acceleration, centripetal acceleration, and accelerating charges will emit radiation of continuous spectrum - there will be no stable energy levels and no atom will be stable.
     
  12. Apr 15, 2009 #11
    So it means that they are continuously giving radiation of same type in rutherford which give a continuous radiation.
     
  13. Apr 15, 2009 #12

    malawi_glenn

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    the radiation is continuous in time and in wavelength
     
  14. Apr 15, 2009 #13
    Thanks mate,are there any links that you know which has got the lectures on bohr's model of atom along with rutherford's and sommerfield's.
     
  15. Apr 15, 2009 #14

    malawi_glenn

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  16. Apr 15, 2009 #15
    Why the orbit energy in bohr model is negative?
     
  17. Apr 15, 2009 #16

    malawi_glenn

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    all bound states has negative energy. (It all boils down to where you define the 0 level of energy).
     
  18. Apr 15, 2009 #17
    What is meant by bound states?
     
  19. Apr 15, 2009 #18

    malawi_glenn

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    have you not done classical mechanics with planetary orbits and stuff? :O

    roughly speaking, a system is bound if it's kinetic energy in the centre of mass system is smaller than the potential energy.
     
  20. Apr 15, 2009 #19
  21. Apr 15, 2009 #20

    malawi_glenn

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    and since one often counts potential energy as negative, the energy of a bound system will become negative.
     
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