Which of the following quantities is zero on an average for the molecules of an ideal gas in equilibrium?
A
Kinetic energy
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B
Momentum
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C
Density
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D
Speed
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Solution
The correct option is B Momentum In case of ideal gases the average velocity is always zero. Hence the average momentum is zero. Whereas average speed is non- zero so the kinetic energy also non-zero, as these two are scalar quantities.