## Quiz 2 [ENDORSED]

H-Atom ($E_{n}=-\frac{hR}{n^{2}}$)

Anna De Schutter - 1A
Posts: 66
Joined: Wed Feb 21, 2018 3:01 am

### Quiz 2

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

Josian1A
Posts: 17
Joined: Tue Nov 14, 2017 3:00 am

### Re: Quiz 2

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.

Anna De Schutter - 1A
Posts: 66
Joined: Wed Feb 21, 2018 3:01 am

### Re: Quiz 2

Thank you!!

Tina Wen 1G
Posts: 31
Joined: Fri Apr 06, 2018 11:05 am

### Re: Quiz 2

So we won't be tested on the original equation that explains the concept?

Chem_Mod
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### Re: Quiz 2  [ENDORSED]

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.