Lesson 8, Topic 4
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# Nuclear Energy

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The protons and neutrons in the nucleus of an atom are called nucleons. The energy required to completely separate the protons and the neutrons of an atom is called binding energy.

Binding energy is the energy released to join or fuse together the nucleons of the nucleus.

When nucleus of an atom is separated, the combined mass of proton and neutron when added together is more than the mass of the nucleus as a unit

The difference in mass is called mass defect. Mass defect is the gain or loss in mass produced when the protons and neutrons in the nucleus are separated or joined together.

Mass defect = sum of masses of proton and neutron – mass of nucleus

ΔM = mass defect

Einstein showed that mass and energy are related by the equation

E = MC2

= ΔMC2

E = energy released

ΔM = is the mass defect

C = speed or velocity of light

1amu = 1.66 x 10-27 Kg, 1u = 931Mev = 1.49 x 10-10 J

Ev = 1.6 x 10-19j.

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