Introductory Bohrs Model Problem...and I'm Lost!! Ok, so I "think" what Im trying to find here is the frequency of the energy between two states of energy. I admit that part of my problem probably lies in the fact that I'm not even sure what it is I'm trying to find. My class seems to be just speeding through this material. But this is my first science class since I dropped out of my first year of high school...so I'm probably a little behind! Anyway... So I need to find the frequency between E5 and E3. I understand how to use the formula E5=13.6(1-1/25)=13.056eV. And so the difference between E5 and E3 is .97. Simple enough. And then we have to convert that to joules so we multiply it by 1.6E-19 in order to get 1.552E-19 joules. And then I THINK im supposed to use the formule F=E/H in order to find the frequency. But when I divide 1.552E-19 joules by the constant 6.63E-34 joules, I get 2.34E-54. The problem here is that I know my answer is supposed to be 1288. What am I missing here??