### energy emitted

Posted:

**Thu May 10, 2018 9:58 am**What is the difference between the equations v=R((1/(n1^2))-(1/(n2^2))) and -hR/n^2? What are the similarities? What is their overall relationship?

Created by Dr. Laurence Lavelle

https://lavelle.chem.ucla.edu/forum/

https://lavelle.chem.ucla.edu/forum/viewtopic.php?f=17&t=31566

Page **1** of **1**

Posted: **Thu May 10, 2018 9:58 am**

What is the difference between the equations v=R((1/(n1^2))-(1/(n2^2))) and -hR/n^2? What are the similarities? What is their overall relationship?

Posted: **Thu May 10, 2018 1:27 pm**

The first equation is used to calculate the frequency of the emitted light when electrons transition between energy levels. When light is absorbed, the transition is up to a higher energy level. When light is emitted, the transition is down to a lower energy level. The calculation is always done using (final energy level)- (initial energy level). The second equation is used to calculate the energy at a specific energy level n. However, it can be incorporated into calculating energy transitions. deltaE= Ef-Ei (deltaE= (-hR/n1^2) - (-hR/n2^2). Note that these equations only apply for the hydrogen atom.

Posted: **Thu May 10, 2018 1:32 pm**

Right, the first equation solving for frequency is just a manipulation of the second equation that finds levels at different energy shells!