Physics
To resolve an object in an electron microscope,

The wavelength of the electrons must be greater than the diameter of the object.
None of these
Both A & B
The wavelength of the electrons must be close to the diameter of the object

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Physics
Specific gravity is defined as the ratio of

Density of the substance to the density of water at 4°C
Density of the substance to the density of water
Density of water at 4°C to the density of the substance
Density of the substance to the density of water at 0°C

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