Physics
Middle latitude cyclones are fueled by?

All of these
Energy from falling precipitation
Air high in the atmosphere
Polar continental air masses

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

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

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