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What is Nuclear Binding Energy? (and BE per nucleon curve)

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VIDEO DESCRIPTION ► What is Binding Energy of a nucleus?
If you take a nucleus, and compare its mass with the mass of its constituent particles like protons, neutrons and electrons, you would probably expect both the masses to be the same. But, that is not what happens.
The mass of a nucleus, as it turns out is less than its constituent particles. There is a 'mass defect' between the aggregate - nucleus and its constituent - particles. This can be explained by the concept of Binding Energy.
Binding Energy is the energy needed or the work that needs to be done against the nuclear forces to break apart a nucleus into its constituent particles. Conversely, it is also the energy released when such constituent particle come together to form a nuclei in the first place.
Higher the Binding energy of a nucleus, higher is going to be the stability of the nucleus.
A nuclear transformation that leads to increase in Binding Energy will always lead to the Emission of Energy.
The Binding Energy Curve shows a graphical comparison between the Binding Energy per Nucleon with increasing Mass Number. It can explain the two regions, corresponding to nuclear fission and fusion.
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