Physics
To resolve an object in an electron microscope,

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

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Physics
On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because

plastics have a higher thermal conductivity than metals
metals are good conductor of heat
plastics have a lower density than metals
metals have higher thermal capacity than plastics

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