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### Frequency Condition

Posted: **Mon Oct 22, 2018 10:59 pm**

by **Saachi_Kotia_4E**

Instead of using this: En = - h R / n^2

Can we use this: frequency = R(1/n1^2 - 1/n2^2)

What's the difference? Prof Lavelle uses the first one but the textbook uses the second.

### Re: Frequency Condition

Posted: **Mon Oct 22, 2018 11:02 pm**

by **Jonathan Pai 2I**

The second is a simplified version of the deltaE version of the first one. DeltaE being it is set up as final-initial. The first one shows how the energy is related to the concept, the second one does not.

### Re: Frequency Condition

Posted: **Mon Oct 22, 2018 11:06 pm**

by **anishathomas**

You can use the second equation for sure. The second one is easier to use because it can help find the frequency or use a frequency you already found to use in the formula.