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Why is the mass of a nucleus always less than the sum of the masses of its constituents? 

 

 

 

 
 
 
 
 

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During the formation of the nucleus certain number of neutrons and protons are brought together, the energy  E_b will be released during this process. E_b is called the binding energy of the nucleus. This energy is spent by the nucleus at the expense of their masses. Therefore, the mass of the nucleus formed is less than the sum of the masses of its constituents.

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Safeer PP

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