## Delta E [ENDORSED]

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

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### Delta E

When a principal quantum level decreases down (e.g. n=4 to n=3, a Paschen series), how come the delta E would not become negative?

Michelle Wang 4I
Posts: 63
Joined: Fri Sep 28, 2018 12:27 am

### Re: Delta E  [ENDORSED]

If you are talking about the energy of the photon, it is always positive because a photon is basically the form that energy takes when it is released by an electron moving to a lower energy level. A photon cannot be negative energy, as if the electron was absorbing energy to move to a higher energy level there would be no photon released in the first place. The change in energy of an electron can be negative however as it is losing energy as it goes to a lower level (n). I hope that answers what you were asking?

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