Which of the following quantities is zero on an average for the molecules of an ideal gas in equilibrium ?
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a
Kinetic energy
b
Momentum
c
Density
d
Speed
answer is B.
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Detailed Solution
Average kinetic energy =12mv12+12mv22+12mv32+…⋅N=12mNv12+v22+v32+…≠0Average momentum =mvwr=m(0)=0& Average density = Mass Volume =nmV≠0Average Speed = vav=8kTπm≠c