Physics
The cooling by a desert Cooler is based on:

Hot air replacement
Air Rehydration
Air dehydration
Evaporative Cooling

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

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