Okay, so this one we're going to do the shortcut of taking the rideberg energy equation and just figuring out what the energy of the transition is instead of taking it using the rideberg wave length equation and then putting that into the various other equations then getting your energy out through them. Okay, so we're going to show a short bit about how to do this. So it's very similar to the rideberg equation. So it's energy instead of one over wave, one equals R e and that's the rideberg energy constant which I've written down for you up here. So, hopefully you realize what's going on here. It said that the transition was from R e equals 5 to R e equals 2. So in R3, in this case, N equals 5 is 1 and N equals 2 is R f N equals 3 is 2. So let's just go ahead and plug those in. Let's plug everything in. Notice the negative sign here. Okay, so what is that saying? Is that this transition? Well, we'll see in a second. And again, these are exact numbers so there's no real significant digits here. So in this problem you could put for final lines or whatever, so you fell like it. So I'm going to put it in. Okay, and since I don't have much room on this board, I'm just going to erase these and put 9 and 25. Okay, so this is what I was referring to earlier when I kind of stopped. This number is bigger than this number because everybody clear on that, right? So since that's the case, we're going to get a positive number here. Does that make sense? Since we're subtracting, we're having a bigger number and subtracting smaller number from it. Does that make sense? So the overall answer is going to be negative. Does that make sense? Because this is some negative times of positive. And this is what I was saying since we have this transition going from a higher energy to a lower energy, we would expect to lose energy. Okay, so let's just do this. Okay. So again, this is the energy of one photon, so you would expect this to be a tiny number. They're not dimension, they already got this momentum. I got negative 1.5, 5 times 10 to the negative 19th joules. So that's how much energy it takes to make this transition from energy-wereble 5 to energy-wereble 5. Does that make sense? Let's do another one. Let's do... Kind of a follow-up question where do we go from? And I know probably you guys will figure out what the difference will be without us doing it. But let's do one going from energy level 3 to energy level 5. Okay. I think so. That was general theory of non-what happens to the energy when we lose doubt? So what happens? It was released as like a photon of light or some other type of radiation, like a thermal radiation or something like that. So you have to...it's like that conservation of energy, Bob conservation of energy. You have to...there has to be a constant amount of energy, you know, in the system and surrounding. So yeah, you're releasing it as...that's what I kind of wanted to say. Here, I was going to say HB, but I don't know if it's actually visible light or something like that. So we could say it's thermal energy level 2. So energy in general better kind of connotation if that makes sense. It was a good question. Is that good? Can we kill this one?