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    Hi

    Why do exited Mercury atoms emit photons of characteristic frequencies? and what phenomenon can be used to demonstrate the wave properties of electrons? I thought it was the photoelectric effect

    Thanks in advance
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    (Original post by Vidsify)
    Hi

    Why do exited Mercury atoms emit photons of characteristic frequencies? and what phenomenon can be used to demonstrate the wave properties of electrons? I thought it was the photoelectric effect

    Thanks in advance
    1. Yes, all atoms emit photons of characteristic frequencies. The electrons have specific quantised energy levels. When they move down energy levels, they give out photons that have the same energy as the change in the electron's energy.
    2. De Broglie electron diffraction experiment. Photoelectric effect shows that light behaves as a particle.
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    (Original post by Vidsify)
    Hi

    Why do exited Mercury atoms emit photons of characteristic frequencies? and what phenomenon can be used to demonstrate the wave properties of electrons? I thought it was the photoelectric effect

    Thanks in advance
    The reason for the characteristic frequencies is that the electrons are in discrete energy levels. Therefore there exist only certain fixed energy gaps between them, and not a continuous range of energy gaps. This means when electrons de-excite, the photon they give off can only have fixed energies and hence fixed frequencies.

    Since the exact energy of each level is dependent upon the number of protons in the nucleus, the different frequencies can be used to classify different elements. The key idea is that there are only certain energies that are allowed- an electron cannot be at an energy between these fixed levels.
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    (Original post by morgan8002)
    1. Yes, all atoms emit photons of characteristic frequencies. The electrons have specific quantised energy levels. When they move down energy levels, they give out photons that have the same energy as the change in the electron's energy.
    2. De Broglie electron diffraction experiment. Photoelectric effect shows that light behaves as a particle.
    (Original post by lerjj)
    The reason for the characteristic frequencies is that the electrons are in discrete energy levels. Therefore there exist only certain fixed energy gaps between them, and not a continuous range of energy gaps. This means when electrons de-excite, the photon they give off can only have fixed energies and hence fixed frequencies.

    Since the exact energy of each level is dependent upon the number of protons in the nucleus, the different frequencies can be used to classify different elements. The key idea is that there are only certain energies that are allowed- an electron cannot be at an energy between these fixed levels.
    Thanks guys much appreciated.
 
 
 
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