NEET · Physics · STD 11 - 12 . kinetic theory of gases
Three vessels of equal capacity have gases at the same temperature and pressure. The first vessel contains helium (monoatomic), the second contains fluorine (diatomic) and the third contains sulfur hexafluoride (polyatomic). The correct statement, among the following is
- A All vessels contain unequal number of respective molecules
- B The root mean square speed of molecules is same in all three cases
- C The root mean square speed of helium is the largest
- D The root mean square speed of sulfur hexafluoride is the largest
Answer & Solution
Correct Answer
(C) The root mean square speed of helium is the largest
Step-by-step Solution
Detailed explanation
\(V_{ rms }=\sqrt{\frac{3 KT }{ m }} \propto \frac{1}{\sqrt{ m }}\) \(=\text { maximum for } He\)
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