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Nuclear Physics:

Radioactive decay:

An unstable nucleus becomes more stable by emitting
an alpha particle, beta particle or gamma radiation.


It consists of two protons and two neutrons.
When it is released by an unstable nucleus, the
atom's mass no. goes down by 4 and it's atomic
no. by…

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From the results Rutherford deduced that there was a
nucleus, which is...
Positively charged as it repels alpha
Much smaller than the atom because most
particles passed through without deflection
Where most of the mass of the atom was
He used his theory to estimate the diameter of…

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When a nucleus undergoes fission, it releases...
Two or three neutrons at high speeds
Energy in the form of radiation and kinetic energy of the
fission neutrons.

Most reactor use enriched uranium which mainly consist of
non-fissionable U-238 and 2 or 3% fissionable U-235.

Moderator ­ a solid or a…

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Two small nuclei release energy when they fuse together to form a
nucleus. This only happens if the mass of the product nucleus is
no more than 55.

Fusion is how the sun and other stars make energy. The Sun is
made up from around 75% hydrogen and 25% helium.…


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