We are being asked to calculate the mean free path of hydrogen atoms in interstellar space
The formula for the mean free path is
d = diameter of the molecule
(N/V) = density
Interstellar space has an average temperature of about 10 K and an average density of hydrogen atoms of about one hydrogen atom per cubic meter. Calculate the mean free path of hydrogen atoms in interstellar space. Use d = 100 pm as the diameter of a hydrogen atom.
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