Physics
A spring is an example of which of these

Conservation of mass law
Newton's 1st law
Newton's 3rd law
Hooke's law

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

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