1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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
    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.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook