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If the molecular weight of two gases are $M_1$ and $ M_1$, then at a temperature the ratio of root mean square velocity $v_1$ and $v_2$ will be
  • A$\sqrt {\frac{{{M_1}}}{{{M_2}}}} $
  • B$\sqrt {\frac{{{M_2}}}{{{M_1}}}} $
  • C$\sqrt {\frac{{{M_1} + {M_2}}}{{{M_1} - {M_2}}}} $
  • D$\sqrt {\frac{{{M_1} - {M_2}}}{{{M_1} + {M_2}}}} $
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