Questions
A cubical box of side 1 m contains helium gas (atomic weight 4) at a pressure of . During an observation time of 1 second, an atom travelling with root- mean-square speed parallel to one of the edges of the cube was found to make 500 hits with a particular wall, without any collision with other atoms. Take R = and k = . Evaluate average kinetic energy.
detailed solution
Correct option is A
Distance travelled in one second =500×2m=1000m. So, vRMS=1000 ms−1But vRMS=3RTM⇒T=160KAverage kinetic energy per atom = 32kT=32×1.38×10–23×160 = 3.312×10–21JTalk to our academic expert!
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A jar has a mixture of hydrogen and oxygen gas in the ratio of 1 : 5. The ratio of mean kinetic energies of hydrogen and oxygen molecules is
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