Physics
Kepler's law of planetary motion states that the square of the time period is proportional to the

Cube of the semi-major axis
Square of the semi-major axis
Semi-major axis
Fourth power of the semi-major axis

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

The doped silicon piece will become n-type
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

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