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NEET2022PhysicsKinetic Theory of GasesActual

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:

Options

  1. AAll vessels contain unequal number of respective molecules
  2. BThe root mean square speed of molecules is same in all three cases
  3. CThe root mean square speed of helium is the largest
  4. DThe root mean square speed of sulfur hexafluoride is the largest

Correct answer

C. The root mean square speed of helium is the largest

Step-by-step solution

As, V _ rms = 3 KT m Hence, v_ rms 1 ~m So, lower the mass, higher/greater the velocity. (where, the symbols have their usual meanings)

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