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Homework Help: Energy transition (bohrs model)

  1. Nov 12, 2014 #1
    1. The problem statement, all variables and given/known data
    By using the Bohr model of the atom:
    whats the lowest energy transition from the n=2 to n=1
    state in Hydrogen (Z=1)
    2. Relevant equations
    En = -13.6eV*Z2/n2

    3. The attempt at a solution
    En = -13.6eV*Z2/n2
    n=2 -> n=1 for hydrogen (Z=1)
    E2= -13.6eV*12/22 =-3.4 eV
    E1= -13.6eV*12/12 = -13.6 eV
    deltaE = x1 – x2 = -3.4 + 13.5 = 10.2 eV

    So 10.2 eV is the lowest energy transition from n2 to n1 right?

    Does the constant change with elements?
  2. jcsd
  3. Nov 12, 2014 #2


    User Avatar

    Staff: Mentor

    The question is strangely phrased, as there is no "lowest energy" for the transition, only the transition energy. Your calculation appers correct, although you should put in some effort when writing equations: 22 instead of 22 makes it unreadable.

    Within the limits of the Bohr model (only one electron, fixed nucleus, classical orbits), the constant is always the same.
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