Physics
Water is not suitable as a calorimetric substance because it :

Is a good conductor
Has high specific heat
Has high boiling point
Low latent heat of vapourization

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

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