Atomic Spectra Post Assessment

[Rose_Malki_3G]

An excited hydrogen atom emits light with a frequency of 1.14x10^14 Hz to reach the energy level n = 4. In what principle quantum level did the electron begin?

Can someone please walk me through how to do this problem? Because whenever I get an answer using the rubber equation for n it is never a whole number so I know I am doing it wrong

[Kaitlyn Hernandez 3I]

I used this equation:



Then, I plugged all of the given values in like this:


All you have to do now is isolate and solve. When you do, you should get n = 6.

If you want to check your work, plug everything back in to make sure that you get :)

[Catie Donohue 2K]

Could someone please walk me through this problem using the deltaE = -hR/n^2-(-hR/n^2) method that he showed in the lecture?

I've used the deltaE=hv equation to solve for the total change in energy, which I got to be 7.55*10^-20 J. I then substituted that into the equation with the necessary constants to solve for n on the far right side of the equation (since we know the n=4 state is the final state and that is being subtracted by the initial state, which we don't know yet).

I got that n=3.285, but I'm not sure where I went wrong.

[Sarah Salam 1J]

Could someone please walk me through this problem using the deltaE = -hR/n^2-(-hR/n^2) method that he showed in the lecture?

I've used the deltaE=hv equation to solve for the total change in energy, which I got to be 7.55*10^-20 J. I then substituted that into the equation with the necessary constants to solve for n on the far right side of the equation (since we know the n=4 state is the final state and that is being subtracted by the initial state, which we don't know yet).

I got that n=3.285, but I'm not sure where I went wrong.

I'm wondering the same thing too, since I tried to solve this with both equations. Using the other equation I got 6. When I used this one, I got about 5.3. Close to 6, but not close enough. I think it might have something to do with the h, since the rest of the equation is very similar to the other equation I used. Or did I make a calculation error, or something else?