## post assessment

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

Maggie Doan 1I
Posts: 61
Joined: Fri Sep 28, 2018 12:24 am

### post assessment

In the hydrogen atomic spectrum, what is the wavelength of light associated with the n = 2 to n = 1 electron transition?

When I worked this problem out, I got -1.22 x 10^-7 as the answer but this isn't correct.

Gary Qiao 1D
Posts: 66
Joined: Fri Sep 28, 2018 12:26 am

### Re: post assessment

I'm sure that the value 1.22 x10^-7 is correct, but you have to also be aware that the negative that you got from the calculations earlier comes from the hydrogen atom emitting energy. This means that when the problem asks for the wavelength, the wavelength must have a positive value because a negative wavelength is not possible. Same goes for the frequency. Hope this helps!