## Homework #1.11

H-Atom ($E_{n}=-\frac{hR}{n^{2}}$)

Dang Lam
Posts: 55
Joined: Thu Jul 27, 2017 2:01 am

### Homework #1.11

The question asks "What is common to the lines within a series (lyman/balmer,etc..) that makes grouping them logical?

David Minasyan 1C
Posts: 54
Joined: Thu Jul 13, 2017 2:00 am

### Re: Homework #1.11

I think this refers to the fact that for lyman series, for example, the energy levels are jump up from n=1 to the other energy levels or they all come down from other energy levels to n=1. Same applies to balmer and paschen except for n=2 and n=3, respectively. Also it could mean the fact that lyman series was all UV light (I think), and paschen was all infrared for example. These were the examples we talked about last week by the way.

Priyanka Bhakta 1L
Posts: 50
Joined: Fri Sep 29, 2017 6:04 am

### Re: Homework #1.11

Yes, as stated above, the groupings for the atomic spectra series are based on the lowest energy level involved in an electron's jump to a higher energy level or fall down to a lower energy level. Something key to remember is that when a question asks which series the wavelength of light that caused the emission or absorption was from, it always refers to the lowest energy level addressed. Thus, even if you have a problem that talks about an electron moving from n=3 to n=1, the fall will have been in the Lyman series because the lowest level was n=1. In another instance, if the question asks about a movement from n=3 to n=5, that jump would have been part of the Bashen series since that series includes the wavelengths from n=3.

In addition, the series are also recognized by the region of the EM spectrum they are in; Lyman is UV, Balmer is visible.

Hope that helps clear things up!