Sapling Energy Level and Wavelength

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KMcFarland_2L
Posts: 90
Joined: Wed Sep 30, 2020 9:52 pm

Sapling Energy Level and Wavelength

Postby KMcFarland_2L » Thu Oct 29, 2020 12:50 pm

The question in Sapling asks for the beginning and ending energy levels of the electron that produced a specific wavelength of emission spectrum. For this question, I used Rydberg's equation then trial and error to find the energy levels, is there another formula/equation that would be better to use?

Stuti Pradhan 2J
Posts: 153
Joined: Wed Sep 30, 2020 9:32 pm
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Re: Sapling Energy Level and Wavelength

Postby Stuti Pradhan 2J » Thu Oct 29, 2020 1:15 pm

I am not sure exactly what question you are referring to, but if a colored line is produced, that means it is part of the Balmer series, so n=2. If the question does not specify anything about the type of radiation emitted, you can check if the wavelength is part of the visible light region (420 to 700 nm) or the UV region, which can help you figure out if the final energy level is n=2 or n=1 (Balmer or Lyman series). From there you should be able to figure out the initial energy level.

Hope this helps!

Mikayla James 2A
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Re: Sapling Energy Level and Wavelength

Postby Mikayla James 2A » Thu Oct 29, 2020 1:45 pm

Hi! I think you're talking about question 11 on the sapling hw (you might not be, but it's a similar question so I'll explain how I worked through it). I didn't use the Rydberg equation solving this one, I just used ΔE = E2-E1 and En = -(hR)/(n)^2. So because the wavelength of the emission is 434 nm, we know that n1=2 because it's the Balmer series. From there, I calculated the energy of the 434 nm emission, which is the ΔE value. Then using the En equation, I calculated the energy for n=2. Because ΔE = En - E2, I substituted the values calculated for ΔE and E2 above to get En = 8.7022x10^-20 J and used that value in the En=-(hR)/(n)^2 to find that n2=5. Depending on your preference, this method may be easy or more complicated for you, but I hope this helps!

Jordan_OBrien_2k
Posts: 53
Joined: Wed Sep 30, 2020 9:43 pm

Re: Sapling Energy Level and Wavelength

Postby Jordan_OBrien_2k » Sun Nov 01, 2020 11:55 am

Hey! For this question, you have to remember that visible light is within the Balmer series. This means that the final state has to be n=2. You then use the Rydberg equation to find n2. Lastly, you would use lambda=hv to find the wavelengths of each respective energy level.


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