Physics
Heavy water is used in nuclear reactor to

Increase speed of neutron
Absorb neutron
Slow down neutron
Increase temperature

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Physics
When a piece of pure silicon is doped with aluminium, then

The resistivity of the doped silicon piece will increase
The conductivity of the doped silicon piece will remain the same
The doped silicon piece will become p-type
The doped silicon piece will become n-type

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