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### Quiz 2

Posted: Sat Apr 21, 2018 11:37 am
Hi!

For quiz 2 if it asks us for example to calculate the frequency of light emitted by an electron that goes from n=4 to n=2 can I use the Rydberg equation:

frequency = R [(1/n1^1) - (1/n2^1)]

or should I go through these calculations:

delta E = E(final) - E(initial) = E2-E4= (-1/4*h*R) + (1/16*h*R) and then find the frequency by doing frequency=delta E/h

Thank you so much!
Anna De Schutter - section 1A

### Re: Quiz 2

Posted: Sat Apr 21, 2018 12:35 pm
I asked some of the TAs/UAs and they said that it would be fine to use the Rydberg equation, because essentially the Rydberg formula is just a simplified equation derived from $\Delta E = E_{f} - E_{i}$ (where $E =- \frac{hR}{n^2}$ ). I believe the purpose of Dr. Lavelle doing it step-by-step in class was to show us how calculating energy in transition states makes sense conceptually; rather than just giving us a formula and accepting it as true.

### Re: Quiz 2

Posted: Sat Apr 21, 2018 12:44 pm
Thank you!!

### Re: Quiz 2

Posted: Sat Apr 21, 2018 4:00 pm
So we won't be tested on the original equation that explains the concept?

### Re: Quiz 2  [ENDORSED]

Posted: Mon Apr 23, 2018 3:18 pm
What do you mean by the original equation? You are expected to conceptually understand the equation for energy given you to by Prof. Lavelle in class. He prefers this over the Rydberg equation, because that equation allows you to plug and chug without understanding the idea behind it.