## HW 1.15

$c=\lambda v$

Bree Perkins 1E
Posts: 34
Joined: Fri Apr 06, 2018 11:04 am

### HW 1.15

Hi Everyone, I am working on the homework and am trying yo figure out problem 1.15 but I am having a little trouble getting started. I know that it gave us the wavelength, and I am assuming we are supposed to use Rydberg's equation for it, but other than that, I am not quite sure what to do. I just need some help getting started.
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SammiOrsini_1B
Posts: 45
Joined: Fri Apr 06, 2018 11:04 am

### Re: HW 1.15

Im stuck on this problem too, but to get it started i used the equation where c=v*lamda and rearranged the equation to solve for v(frequency). With v i know you can use the equation with Rydberg constant which is given by v=R{(1/n1^2)-(1/n2^2)}. However after I got that far i could not figure the rest out but i am still working on it.

jessicasam
Posts: 36
Joined: Wed Nov 15, 2017 3:02 am
Been upvoted: 1 time

### Re: HW 1.15

You know that you need the equation v=R{(1/n1^2)-(1/n2^2)} to find the n values. But first you need to find the value of v.

v=c/λ
=3.00 x 10^8 ms-1/ 102.6 x10^-9 m
= 2.922 x 10^15 s-

You also know that n1=1 because of the Lyman series so the unknown you are looking for is n2.

Rearrange the equation to find n2

1/n2^2= (1/n1^2)- v/R

Now fill in with values

1/n2^2= (1/1^2) - (2.922 x 10^15 s-/ 3.29 x 10^15 s-1)
= .112
n2= 3

so n1=1 and n2=3

Jordanmarshall
Posts: 16
Joined: Fri Apr 06, 2018 11:03 am

### Re: HW 1.15

So would everything be the same if you were looking for n3??