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Homework Help: Hydrogen spectrum

  1. May 22, 2010 #1
    1. The problem statement, all variables and given/known data
    The hydrogen spectrum contains a blue line with a wavelength of 434nm. Photons of blue light are emitted when hydrogen's electron drops from the fifth energy level to a lower energy level. What is the lower energy level?


    2. Relevant equations
    1/wavelength = R [ 1/n2^2 - 1/n1^2]


    3. The attempt at a solution
    1/(4.34*10-7m)= (1.097 x 10^7 m^-1) [1/n2^2 - 1/5^2]
    2,304,147/(1.097*10^7) = 1/n2^2-0.04
    0.21n2^2=1
    n2=2.182
    thus i found that the lower energy level is 2 , is this correct ?
     
  2. jcsd
  3. May 22, 2010 #2
    Yes, if n2 = 2 it's called Balmer series and this is the only series that falls in the visible spectrum.
     
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