Physics
Hot water is poured simultaneously in four metallic tumblers painted outside with different points. After some time the water will be found to have cooled most in the tumbler painted.

Shining white
Rough white
Shining black
Rough black

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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
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
It uses more powerful lenses

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