2. Nuclear

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Half life

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11 Terms

1

Half life

Time taken for the number of unstable nuclei to decay to half its original value

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2

Activity

Rate of decay of nuclei in a radioactive sample

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3

Decay constant

Probability of a single nucleus decaying per unit time

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4

Atomic mass unit

1/12th the mass of an atom of C-12

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5

Mass defect

The difference between an atoms mass and the sum of the masses of its protons and neutrons

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6

Binding energy

Minimum energy required to separate a nucleus into constituent protons and neutrons

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7

Fission

Splitting a large nucleus into smaller nuclei

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8

Induced fission

Stable nucleus splits into smaller nuclei due to collision of slow moving neutron

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9

Thermal neutrons

Slow moving neutrons with low kinetic energy which are in thermal equilibrium with moderator

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10

Critical mass

Minimum amount of fuel to maintain a steady chain reaction

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11

Fusion

Binding of 2 small nuclei to produce larger nuclei

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