1. Not finding help here? Sign up for a free 30min 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!

Calculate Rh value from Rydberg Equation

  1. Oct 29, 2013 #1
    1. The problem statement, all variables and given/known data
    λ for one line of the hydrogen spectrum is .4118 x 10-4 cm. Use this value in the Rydberg equation to calculate the RH value using n1 = 2, and n2 = 3.


    2. Relevant equations
    ## \frac{1}{ \lambda } = \frac{R_{h}}{hc} ( \frac{1}{n_{x}^{2}}-\frac{1}{n_{y}^{2}})##
    ## \frac{1}{ \lambda } = R( \frac{1}{n_{x}^{2}}-\frac{1}{n_{y}^{2}})##
    ##\lambda = 0.4118 x 10^{-4} cm= 4.118 x 10^{-5} cm = 4.118 x 10^{-7}m##
    ##x_{1} = 2##
    ##X_{2} = 3##
    ##h=6.626 x 10^{-34} J*s##
    ##c=2.998 x 10^{8} m/s##

    3. The attempt at a solution
    ## \frac{1}{4.118 x 10^{-7}m} = \frac{R_{h}}{(6.626 x 10^{-34} J*s)(2.998 x 10^{8} m/s)} ( \frac{1}{2^{2}}-\frac{1}{3^{2}})##
    ##R_{h}=3.473x10^{-18}##
    This is wrong however
     
  2. jcsd
  3. Aug 14, 2017 #2

    TeethWhitener

    User Avatar
    Science Advisor
    Gold Member

    This is the right answer as far as I can tell. Maybe your answer got auto-rejected from a web-based homework form for the wrong number of sig figs?
     
  4. Aug 14, 2017 #3

    Charles Link

    User Avatar
    Homework Helper

    Or they might want an ## E ## in place of your ## x ##. ## R_H ## needs to be defined, and what units are they looking for=SI/MKS or electron-volts? The statement of the problem appears to be poorly defined. (A google showed this same question appeared on the Chem Forums website.)
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Calculate Rh value from Rydberg Equation
Loading...