A vessel is partitioned in two equal halves by a fixed diathermic s...

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A vessel is partitioned in two equal halves by a fixed diathermic separator. Two different ideal gases are filled in
\( \mathrm{P} \) left \( (L) \) and right \( (R) \) halves. The rms speed of the molecules

W 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) \( 3 \pi / 8 \)
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