Fuison/fission, where does the energy come from?

  • Thread starter wavingerwin
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In summary, Iron has the most binding energy per nucleon amongst elements, so it is the most stable. This surplus in binding energy per nucleon comes from the rest mass deficit of the product atoms compared to the reactants. Atomic bombs use principles in fission and fusion to create the energy released for the 'explosion'. This energy comes from the mass deficit between product and reactant, and the external energy supplied for the increase in binding energy.
  • #1
wavingerwin
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I've been wondering,
Iron has the most binding energy per nucleon amongst elements and thus realized to be the most "stable" element.

Smaller or bigger elements (compared to iron) can fuse or undergo fission respectively.
As they fuse or undergo fission, it becomes more stable (the product element will have more binding energy per nucleon, losing its average mass per nucleon).

This surplus in binding energy per nucleon comes from the rest mass deficit of the product atoms compared to the reactants.

Atomic bombs use principles in fission and fusion. So, where does the energy released for the 'explosion' come from?

if it comes from the mass deficit between product and reactant, where does the energy for the increase in binding energy come from?

Thank you!
 
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  • #2
Binding energy is negative. Otherwise elements would all just fall apart!
 
  • #3
It comes from the force between nucleons.
 
  • #4
To add my two cents worth to the two correct responses above: The binding energy is the average energy required to unbind a nucleon from the nucleus. It doesn't come from anywhere because it is not a form of energy but an energy deficit. It is like gravitational potential energy. We say an object on the Earth surface has -GmM/R of gravitational binding energy. It takes that much energy to unbind it from the Earth's gravitation.

AM
 
  • #5
v_bachtiar said:
I've been wondering,
Iron has the most binding energy per nucleon amongst elements and thus realized to be the most "stable" element.

Smaller or bigger elements (compared to iron) can fuse or undergo fission respectively.
As they fuse or undergo fission, it becomes more stable (the product element will have more binding energy per nucleon, losing its average mass per nucleon).

This surplus in binding energy per nucleon comes from the rest mass deficit of the product atoms compared to the reactants.

Atomic bombs use principles in fission and fusion. So, where does the energy released for the 'explosion' come from?

if it comes from the mass deficit between product and reactant, where does the energy for the increase in binding energy come from?

Thank you!
it is known that to bring the two nuclei together(because there is electrostatic repulsion) , there is needed some force,supplied by external energy source,but when nuclei bring together they suffer opposing force cancelling net effect.But its important to notice than these external energy cannot be lost ,so this energy is added to binding energy(as nuclear energy),but the big amount of mass is lost contributing the energy release.Donot be confused that these beneficial energy came from loosing matter of nucleons and not from original binding energy.And talking about final binding energy its the original binding energy plus the kinetic energy (original external energy supplied)
 

1. What is the difference between fusion and fission?

Fusion is the process of combining two or more atomic nuclei to form a heavier nucleus. Fission is the process of splitting a heavy atomic nucleus into two or more lighter nuclei.

2. Where does the energy come from in fusion and fission reactions?

In fusion reactions, energy is released when the nuclei of atoms combine to form a heavier nucleus. In fission reactions, energy is released when a heavy nucleus splits into two or more lighter nuclei.

3. What elements are involved in fusion and fission reactions?

Fusion reactions involve the fusion of light elements such as hydrogen and helium, while fission reactions typically involve heavy elements such as uranium and plutonium.

4. How is energy harnessed from fusion and fission reactions?

In both fusion and fission reactions, the energy is released in the form of heat. This heat can then be used to generate steam, which in turn drives turbines to produce electricity.

5. What are the potential benefits and risks of fusion and fission energy?

The potential benefits of fusion and fission energy include a nearly limitless supply of energy and a reduced dependence on fossil fuels. However, the risks include the potential for accidents and the production of radioactive waste that must be carefully managed.

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