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Modern Physics, Finding wave length problem! wee 
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#1
Apr1206, 02:46 PM

P: 1,629

Ello ello!
I'm having troubles getting this table started. The directions are: Use the Bohr diagram shown below to complete the following table. Tell the wavelength and color of light emitted when the following energy level changes occur. Orbital change n = 4 to n = 1 Wavelength = ? Color/Type Select: red/UV/green/IR/blue Well once i find the wave length i'm pretty sure i can just look at the table, and find the correct color it corresponds too. So if n = 4, that looks like its pointing to the UV spectrum, but what are those numbers under it? such as: 397 389 etc So it goes to n =1, that means it is going to give off light. and n =1 looks lkike its still in the UV spectrum. so would i take the wave lengths: 397  389 = 8nm? i'm assuming those numbers are in nano meters. So the color type would be UV which i got right. But i'm still confused on the wave length. I subbmited 8nm as my answer and it was wrong.Any help would be great! 


#2
Apr1206, 02:57 PM

PF Gold
P: 621

In the circular diagram, there is an arrow that signals the n=4 to n=1 transition. The arrow signifies the photon that is emitted when an electron drops from the n=4 to n=1 state.
Yes the numbers are the wavelength in nanometers. 


#3
Apr1206, 03:08 PM

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P: 41,323




#4
Apr1206, 06:18 PM

P: 1,629

Modern Physics, Finding wave length problem! wee
thanks guys that worked for the first, the answer was: 389 nm, and it was UV. I just looked at n4 and followed the arrow to the 389.
but i went onto the next one which is: n = 4 n = 2, i wrote down the wave length of the n = 2, and the n =4, both wrong and its also saying its not even UV light anymore. But if u follow the arrows n = 2, and n = 4 are both in the UV. Any ideas what i'm misinterpreting? thanks! 


#5
Apr1206, 06:34 PM

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P: 41,323

A wavelength corresponds to a transition between two levels, so to say that you found the wavelength for n = 2 or n = 4 doesn't make sense. Find the arrow that shows the electron falling from n = 4 to n = 2; that's the one you want.



#6
Apr1206, 10:16 PM

P: 1,629

Oo i got what your saying now! thanks a ton Doc!



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