## Problem from Audio Visual Focus Topic

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

DTingey_1C
Posts: 55
Joined: Fri Aug 30, 2019 12:16 am

### Problem from Audio Visual Focus Topic

How do you solve this problem, I keep getting non-whole numbers but the answer is n=6 :/.

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?

Thank you

SnehinRajkumar1L
Posts: 101
Joined: Thu Jul 11, 2019 12:15 am

### Re: Problem from Audio Visual Focus Topic

You would solve this using the delta E equation. Substitute hv (Planck's constant * frequency) for delta E and set up the other side using the difference in energy (-hR/n^2-(-hR)/n^2). Plug in the appropriate numbers and solve. Don't forget to inverse and square root properly and you should get the right answer.