1.what is binding energy per nucleon? 2. Please explain mass defect in the example of fission of Uranium into barium and krypton.

Asked by A M | 22nd Aug, 2010, 12:40: PM

Expert Answer:

It is observed that atomic mass of all nuclei (except hydrogen) is different from the sum of masses of protons and neutrons. The difference is termed mass defect.

 Mass defect = Total mass of nucleons – observed atomic mass
 The mass defect is converted into energy. This energy is called the binding energy. This is the energy required to break the nucleus into is constituents (p and n).
When this binding energy is divided by the total number of protons and neutrons we get binding energy per nucleon.
U235 + Neutron ----> Ba143 + Kr90 + 3Neutrons.
So the total mass in amu on left side is 236.05262 amu    (U + Neutron)
and total mass on right hand side is 235.86614.
Hence mass defect =236.05262 - 235.86614 = 0.18648 amu                                                                      Regards,

Answered by  | 22nd Aug, 2010, 11:09: PM

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