Delta E values


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Miriam Sheetz 2B
Posts: 64
Joined: Fri Sep 28, 2018 12:25 am

Delta E values

Postby Miriam Sheetz 2B » Fri Oct 12, 2018 1:31 pm

For V=E/h, why do we use the a positive delta E value even though it is actually negative?

Andrew Sun 1I
Posts: 30
Joined: Fri Sep 28, 2018 12:18 am

Re: Delta E values

Postby Andrew Sun 1I » Fri Oct 12, 2018 1:35 pm

Yes, when the original calculation gives a negative value it just signifies that there was a negative change overall, but you can't have negative energy. The negative sign is just there for conceptual understanding.

Sameen Mahmood 3D
Posts: 37
Joined: Wed Jun 13, 2018 3:00 am

Re: Delta E values

Postby Sameen Mahmood 3D » Fri Oct 12, 2018 2:09 pm

For the equation E=hv, you're trying to calculate the energy of a photon. The energy of an emitted photon can never be negative, that just doesn't make sense. When we discuss a negative delta E we're talking about a loss of energy. That equation doesn't deal with energy change; the equation E=(-hR)/n^2 does. That's where a negative E is permitted, because when electrons lose energy their energy in essence becomes "more negative". I hope that helped!!


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