A vessel is partitioned in two equal halves by a fixed diathermic separator. Two different ideal gases are filled in left $(L)$ and right $(R)$ halves. The rms speed of the molecules in $L$ part is equal to the mean speed of molecules in the $R$ part. Then the ratio of the mass of a molecule in $L$ part to that of a molecule in $R$ part is
  • A$\sqrt {\frac{3}{2}} $
  • B$\sqrt {\pi /4} $
  • C$\sqrt {2/3} $
  • D$3\pi /8$
Medium
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