A) hydrogen, helium, nitrogen, oxygen
B) oxygen, nitrogen, hydrogen, helium
C) oxygen, nitrogen, helium, hydrogen
D) nitrogen, oxygen, helium, hydrogen
Correct Answer: C
Solution :
de-Broglie wavelength of a gas \[\lambda =\frac{h}{\sqrt{3mk{{B}^{T}}}}\] \[r\propto \frac{1}{\sqrt{m}}\] we have, \[{{m}_{{{O}_{2}}}}>{{m}_{{{H}_{2}}}}>{{m}_{He}}>{{m}_{{{H}_{2}}}}\] \[\therefore \] \[{{\lambda }_{{{O}_{2}}}}<{{\lambda }_{{{H}_{2}}}}<{{\lambda }_{He}}<{{\lambda }_{{{H}_{2}}}}\]
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