Energy change and Energy of photon
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Energy change and Energy of photon
If a hydrogen atom goes from n=3 to n=1, why is the change in energy negative and why is the energy of the photon emitted positive?
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Re: Energy change and Energy of photon
Going from a higher energy level to a lower, the change is negative, but photon energy is always positive, so if you set them equal to each other you would need a negative sign.
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Re: Energy change and Energy of photon
The change in energy would be negative because it is going from a higher energy state to a lower energy state. It is important to remember that only the change in energy can be negative, not energy itself.
Re: Energy change and Energy of photon
The energy in a hydrogen atom depends on the energy of the electron. When you move from a higher state to a lower state, it decreases energy and the atom emits photons. The photon energy will always be positive.
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Re: Energy change and Energy of photon
When atoms are going from a higher energy level to a lower energy level you would use the equation E(photon)=-deltaE, which always makes energy of the photon positive. When you have a negative change in energy it means light is emitted and the energy of the light emitted is always a positive number.
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Re: Energy change and Energy of photon
You cant have negative energy of a photon so just because the energy change is negative it doesn't mean you have negative energy.
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