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I was studying for an upcoming test on Nuclear Technology, and I am unable to do the calculations for this unit. Ill post 2 of the many problems which I can’t do.

Calculate the binding energy for an atom of Uranium – 235.

My working:

Number of:

Protons – 92

Neutrons – 143

Therefore, mass of protons = [tex]92 \times 1.67265\times 10^-27 = 1.538838\times 10^-25[/tex]kg

Mass of neutrons = [tex]143 \times 1.67496\times 10^-27 = 2.3951928\times 10^-25[/tex]kg

Combined mass of nucleons = [tex]3.93440308\times 10^-25[/tex]kg

From here I do not know where to go.

Under certain circumstances, a gamma ray photon may suddenly change into an electron and positron as in the following equation:

[tex]\gamma \rightarrow e^0_-1 + e^0_+1[/tex]

Calculate the minimum energy of the photon.

This problem has me completely lost, as I don not understand how a gamma ray with no mass can all of a sudden be broken down into the two parts, and electron and a positron which have a mass.

Many thanks for any replies with the slightest help, as I am completely lost on these equations plus similar ones.

Thanks,

Pavadrin