## Delta

005095564
Posts: 30
Joined: Wed Sep 18, 2019 12:18 am

### Delta

Can someone explain why delta is negative when the change in an electron goes from N=1 to N=3?

romina_4C
Posts: 100
Joined: Thu Jul 11, 2019 12:17 am

### Re: Delta

I think when an e- goes from n=3 to n=1 the change in energy is negative because its releasing energy (going from a higher energy state to a lower one, and the change in energy is measured as En(final) - En(initial)). Going from n=1 to n=3 should be a positive change in energy since you have to absorb energy to move up the energy levels.

TYun_1C
Posts: 52
Joined: Wed Sep 11, 2019 12:16 am

### Re: Delta

Whenever a electron goes from a higher energy state to a lower one the electron's energy has decreased and the energy is released as electromagnetic radiation, so we use the negative sign to describe the change in energy. This can be calculated through E=-hR/n^2 and delta E= Ef-Ei. Hope this helps!!

ranqiao1e
Posts: 51
Joined: Sat Sep 14, 2019 12:15 am

### Re: Delta

the change in energy should not be negative when n goes from 1 to 3 because electrons need to absorb energy in order to do that, making the sign in front of delta always a positive one.