Which of the following processes would lead to an increase in the average speed of the molecules of an ideal gas system?
A
Decreasing the temperature of the system
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B
Compressing the gas with a piston
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C
Expanding the gas into a vacuum
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D
Heating the system keeping V and P constant.
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Solution
The correct options are A Compressing the gas with a piston D Heating the system keeping V and P constant. Averagespeedμav=√8RTπM ∴μav∝TM. Average speed μav∝T. Pressure and temperature is directly proportional to average speed. Hence options B & D are correct..