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Thread: Binding Energies of Proton-Proton Chain

  1. #1 Binding Energies of Proton-Proton Chain 
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    I've worked out the binding energy of a helium-4 nucleus, but to find out the number of proton-proton chains occuring every second from the total output of the sun every second, would i have to work out the binding energies of a helium-2 nucleus and helium-3 nucleus?

    Basically: is the total energy output of a proton-proton chain equal to the binding energy of a Helium-4 nucleus, or do i have to include all the steps in the chain's binding energies as well?


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  3. #2  
    Moderator Moderator Dishmaster's Avatar
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    I think, this should help you.
    http://en.wikipedia.org/wiki/Proton-...chain_reaction


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  4. #3  
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    i'd appreciate real help as opposed to people posting for the sake of post count.
    wikipedia is about the most obvious and, frankly, silly thing to suggest.
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  5. #4  
    Forum Masters Degree Numsgil's Avatar
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    In what way did you find the wiki article unhelpful?
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  6. #5  
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    1. i already looked at it
    2.it doesnt answer my question
    3. :'(

    I've also gone through the relevant calculations to find the mass lost from the sun each second.
    I used the solar constant as a basis for the calculation and assumed only the binding energy of helium is released as energy.
    (Solar constant to get total energy output of the sun > energy per proton-proton chain > number of proton proton chain reactions a second > mass lost per proton-proton chain > mass lost in total per second.)

    It comes up short by a factor of 50.

    This suggests another form of energy transduction is prominent in the Sun, is the CNO cycle really that energetic? and that prominent in the sun?
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