21. Kinetic Theory of Ideal Gases
Mean Free Path of Gases
4:15 minutes
Problem 20b
Textbook Question
Textbook QuestionPhotons of light scatter off molecules, and the distance you can see through a gas is proportional to the mean free path of photons through the gas. Photons are not gas molecules, so the mean free path of a photon is not given by Equation 20.3, but its dependence on the number density of the gas and on the molecular radius is the same. Suppose you are in a smoggy city and can barely see buildings 500 m away. a. How far would you be able to see if all the molecules around you suddenly doubled in volume?
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