## Difficulty with Problem 1.55 [ENDORSED]

Alexis Elliott 1J
Posts: 28
Joined: Wed Sep 21, 2016 2:59 pm

### Difficulty with Problem 1.55

For problem 1.55, the wavelength given is in cm^-1. When I attempted to solve this problem I converted the cm to m, but when I checked the solutions manual, the meters where converted to cm, and I got a completely different answer.

I am wondering why the meters in this case where converted to cm and not the other way around, and why (assuming I did my unit conversion correctly, which I believe I did) I still did not get the same answer.

Thank you!

Sydney Wu 2M
Posts: 50
Joined: Fri Jul 22, 2016 3:00 am

### Re: Difficulty with Problem 1.55  [ENDORSED]

I too, at first, converted the cm into m and got a different answer from the SSM. I re-read the problem, and it is says that it's "common to express energy in terms of v/c with units cm-1" (for this particular kind of spectroscopy). So literally all you have to do is set up v/c = some value with units cm-1, plug in the given value and solve. Conversions are not necessary.

Hope this helps :)