A. True, for example there are more earthquakes in California because of the St. Andreas fault
Explanation:
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An opera singer breaks a thin glass with only the use of her high frequency voice
The diffusion coefficient of the gas is proportional to the average rate of thermal motion of the molecules.
the average velocity is inversely proportional to the square root of the molar mass
so
The gas diffusion rate is inversely proportional to the square root of its molecular weight.