Physics
The cooling by a desert Cooler is based on:

Hot air replacement
Air dehydration
Air Rehydration
Evaporative Cooling

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

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

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