FISSION
REACTION:
REACTION:
Definition:
Nuclear fission takes place when a heavy
nucleus, such as
U-235,
splits, or fissions, into two smaller nuclei by absorbing a slow
moving (low-energy) neutron
nucleus, such as
U-235,
splits, or fissions, into two smaller nuclei by absorbing a slow
moving (low-energy) neutron
Explanation:
Nuclear fission was first observed in
1939 by Otto Hahn and Fritz
Strassman. The
uranium nucleus was split into two nearly equal fragments after
absorbing a slow moving (low-energy) neutron.
The process also resulted in the production of typically two or
three neutrons
per fission event. On the average, 2.47 neutrons are released
per event as represented by the expression
1939 by Otto Hahn and Fritz
Strassman. The
uranium nucleus was split into two nearly equal fragments after
absorbing a slow moving (low-energy) neutron.
The process also resulted in the production of typically two or
three neutrons
per fission event. On the average, 2.47 neutrons are released
per event as represented by the expression
Energy
production:
production:
In nuclear fission, the total mass of the
products is less than
the original
mass of the heavy nucleus. Measurements showed that
about 200 MeV of energy is released in each fission event.
But, during the fission of 1 kg of Uranium-235 about 6.7×1011 J of energy is released
1eV =products is less than
the original
mass of the heavy nucleus. Measurements showed that
about 200 MeV of energy is released in each fission event.
But, during the fission of 1 kg of Uranium-235 about 6.7×1011 J of energy is released
1.6 x 10 -19 J
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