Rydberg Equation  [ENDORSED]

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Vincent Chiang 1L
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Joined: Fri Sep 29, 2017 7:05 am

Rydberg Equation

Postby Vincent Chiang 1L » Sun Oct 22, 2017 11:03 pm

In the Rydberg equation, does (n1)^2 always have to be the lower energy level? Or can it be the first given energy level (for example if the problem says it went from energy level n = 4 to n = 2, can n1 be 4)?

Chem_Mod
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Re: Rydberg Equation

Postby Chem_Mod » Mon Oct 23, 2017 10:24 am

Hi Vincent,

That's correct. Depending on whether light is absorbed or emitted, energy levels can either increase or decrease, respectively.

Hope this helps.

alyssawhite1L
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Re: Rydberg Equation  [ENDORSED]

Postby alyssawhite1L » Mon Oct 23, 2017 12:49 pm

This question is largely why Lavelle would prefer we use the equation E = -hR/n^2 and couple it with the equation ΔE=Efinal-Einitial. This way you never have to be concerned about whether or not to use the higher energy level. You only have to know which energy level it started at (initial) and which it ended at (final).

Jacquelyn Hill 1
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Re: Rydberg Equation

Postby Jacquelyn Hill 1 » Mon Oct 23, 2017 5:02 pm

If the problem says that it went from n=4 to n=2, does that mean 2 is the final? Or is 4 the final since it is the higher energy level?

Lily Guo 1D
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Re: Rydberg Equation

Postby Lily Guo 1D » Mon Oct 23, 2017 5:41 pm

If the electron is going from n=4 to n=2, then n=2 would be the final energy state and n=4 would be the initial energy state.

mayasinha1B
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Re: Rydberg Equation

Postby mayasinha1B » Wed Oct 25, 2017 9:21 am

If the electron is going from n=4 to n=2, then it would be going from an excited state to a lower energy state, which would make sense that the resulting Energy from the Rydberg equation would be negative, as energy would be emitted in this scenario. In the equation, n1 is the initial and n2 is always the final, and the equation works itself out to whether the resulting energy is positive or negative.

JamesAntonios 1E
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Re: Rydberg Equation

Postby JamesAntonios 1E » Wed Oct 25, 2017 9:41 am

Rydberg's Equation describes the change in energy. Change is always final-initial, except in very few specific cases.


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