## 1.15

$c=\lambda v$

Essly Mendoza 1J
Posts: 25
Joined: Fri Sep 29, 2017 7:04 am

### 1.15

Hi guys, does anyone know how to get started on this problem?

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

Alex Nechaev 1I
Posts: 50
Joined: Fri Sep 29, 2017 7:04 am

### Re: 1.15

The first thing I did was use v=c/λ to find the frequency of the wave. The value you get here can then be used to evaluate for n(final) in Rydberg's formula, since you know that n(initial) is 1 (because hydrogen starts at n=1). After plugging in all of your calculated values, all you have to do is solve for n(final).

Gabriela Carrillo 1B
Posts: 53
Joined: Fri Sep 29, 2017 7:04 am

### Re: 1.15

I also had a question on this problem, in the solutions manual it plugs in 1 for the value of n1. Should we assume that the initial energy level is always 1? Or is this specifically for hydrogen??

David Minasyan 1C
Posts: 54
Joined: Thu Jul 13, 2017 3:00 am

### Re: 1.15

Yes from what I was told today in my discussion, you can assume that n1 is 1 if it's not given to you.

Girija_3E
Posts: 27
Joined: Fri Sep 29, 2017 7:07 am
Been upvoted: 1 time

### Re: 1.15

Alex Nechaev 1L wrote:The first thing I did was use v=c/λ to find the frequency of the wave. The value you get here can then be used to evaluate for n(final) in Rydberg's formula, since you know that n(initial) is 1 (because hydrogen starts at n=1). After plugging in all of your calculated values, all you have to do is solve for n(final).

I found the frequency first as well. But, is the way that we know that n = 1, because the problem specified that we were considering the ultraviolet spectrum, in addition to the fact that the problem is about hydrogen?