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Hydrogen 4+

  1. Apr 24, 2012 #1
    What is the energy of the n = 1 energy level in the
    B4+ hydrogen-like ion?
    I need it to 4 significant figures...
    I know the equation is

    En=Z squared X -13.60 /n squared..... however I cant work out the answer to four significant figs
     
  2. jcsd
  3. Apr 24, 2012 #2

    phyzguy

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    Why not? You have 13.60 to 4 significant figures. What is Z? What is n?
     
  4. Apr 24, 2012 #3
    Z= 5 for the B and the n= 1 for the energy?
     
  5. Apr 24, 2012 #4

    phyzguy

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    Sounds good. So what's the answer?
     
  6. Apr 24, 2012 #5
    -340...but its needed in 4 significant figures? and i really dont understand how i can get that too it...im dumb :/
     
  7. Apr 24, 2012 #6

    phyzguy

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    You started with 13.6, but it was 13.60 to 4 significant figures, so what is 340 to 4 significant figures?
     
  8. Apr 24, 2012 #7
    340.0.....really? that simple also do i need to keep it to minus or does it change?
     
  9. Apr 24, 2012 #8

    phyzguy

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    It's that simple. Yes, it is negative as you originally had it.
     
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