## Post Assesment Question (Atomic Spectroscopy)

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

Jessica Esparza 2H
Posts: 130
Joined: Wed Sep 18, 2019 12:15 am

### Post Assesment Question (Atomic Spectroscopy)

Hi everyone! So I know the equations we have to use for these types of equations but I'm lost on how we plug everything in and the steps needed to find the answer. Thank you!
An excited hydrogen atom emits light with a frequency of 1.14 x 1014 Hz to reach the energy level n = 4. In what principle quantum level did the electron begin?
A. n = 5 B. n = 6 C. n = 4 D. n = 7

Khushboo_3D
Posts: 60
Joined: Wed Sep 18, 2019 12:19 am

### Re: Post Assesment Question (Atomic Spectroscopy)

For this question, to begin with you would use the equation E= h times frequency, so convert the given frequency in terms of energy.
This is the change in energy, that is the amount of energy emitted when an electron jumps from a higher energy level to a lower one.
This change in energy= energy final- energy initial.
We would then plug in the necessary values, we know all of them except n initial, which we have to find out.
Hope that helps!

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