At( 0°C) and( 1atm) pressure the molecular diameter for a gas is 4×10-8 cm , and the number of molecules = 2.689×1019 molecules .the mean free path is given by

electron microscopy and scanning tunneling microscopes gives us a greater understanding of atoms by being able to see the atom itself, and lets us see some atomic reactions.

explanation:

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c) should be the answer.