Physics
Metals are good conductors of electricity because:

All of these
The atoms are lightly packed.
They have high melting point.
They contain free electrons.

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

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

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