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

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

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Physics
An electron microscope gives higher magnification than an optical microscope, because :

The wavelength of electrons is smaller as compared to the wavelength of visible light
The electrons have more energy than the light particles
The velocity of electron is smaller than that of visible light
It uses more powerful lenses

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