(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Adjacent wavelengths 251.1 nm and 238.6 nm are found in one series of transitions among the radiations emitted by ionized helium.

1.) Find the value of n_{0}for this series:

Possible answers:

n0= 1, 2, 3, 4, 5

2.) Find the series limit:

Possible answers:

λ_{limit}= 91.13 nm, 205.0 nm, 364.5 nm, 569.5 nm

2. Relevant equations

λ=λ_{limit*}n^{2}/(n^{2}-n^{2}_{0}) where (n=n_{0}+1, n_{0}+2,...)

Nuclear charge for Ionized Helium Z=2

3. The attempt at a solution

I think it need to find maximum energy of the helium atom and use the relation E =hc/λ => λ= hc/E to find the series limit, λ_{limit}, then plug in various values of n via trial and error until i get the right answer. I am however struggling trying to figure out how to find the maximum energy of the atom (assuming this is actually the way to approach the problem).

Thanks for your time.

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# Homework Help: Line Spectra series for Ionized Helium

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