Problem A15

$c=\lambda v$

Jasmin Argueta 1K
Posts: 69
Joined: Fri Sep 28, 2018 12:16 am

Problem A15

Can someone help me solve problem A15? I've been stuck on it for about 20 minutes. I tried using the equation deltaE=-hR(1/finialn^2---1/initialn^2). Then it didn't work so I used v=R(1/finialn^2---1/initialn^2) thats shown in the book. I understand n initial is 1 because Lyman but when I work the problems out I can't seem to get the correct answer. Using the books equation I get 2.914x10^15=(3.29x10^15)(1/finialn^2----1). After this I can't get the answer as n final equals 3.

Andrea Zheng 1H
Posts: 61
Joined: Fri Sep 28, 2018 12:26 am

Re: Problem A15

You got the correct wavelength, however, you just switched n1 and n2 in the equation. The equation should be: wavelength = Rydberg constant *(($\frac{1}{{{n_{1}}^2}}$) - ($\frac{1}{{n_{2}}^2}$)). If you use this, you should get the correct answer of $n_{2}$ = 3.

Sana_Mian_3G
Posts: 30
Joined: Fri Sep 28, 2018 12:23 am

Re: Problem A15

Another equation that can be used is En= -hR/n^2. Use this equation with both n values and then subtract them from each other to get the answer.