Ch. 1.15 hw help


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nick_pantoja_3G
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Ch. 1.15 hw help

Postby nick_pantoja_3G » Sun Oct 02, 2016 4:33 pm

The hw question is "In the ultraviolet spectrum of atomic hydrogen, a line is observed at 102.6 nm. Determine the value of n for the initial and final energy levels of the electron during the emission of energy that leads to this spectral line."

According to the textbook, they say the rydberg equation is R(1/n^2 -1/n^2) however in class we learned it as -hR/n^2.

So my question is, how do you do the problem? And which rydberg equation should we use and how was the one they used derived?

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Re: Ch. 1.15 hw help

Postby Chem_Mod » Sun Oct 02, 2016 6:01 pm

The "Rydberg equation" wasn't introduced to you in lecture because it doesn't always "work." The sign conventions often lead you to the wrong answer. You aren't responsible for knowing what the Rydberg equation is. You can solve those problems using the method shown in lecture (printed in your course reader).

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Re: Ch. 1.15 hw help

Postby Chem_Mod » Sun Oct 02, 2016 11:14 pm

They state ultraviolet spectrum, meaning Lyman series and n1 = 1. Therefore only one variable is unknown.


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