Physics
The earth is a

Bad absorber and bad radiator of heat
Non-absorber of heat
Good reflector of heat
Good absorber and good radiator of heat

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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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