Oxygen is $16$ times heavier than hydrogen. Equal volumes of hydrogen and oxygen are mixed. The ratio of speed of sound in the mixture to that in hydrogen is
  • A$ \sqrt {\frac{2}{{17}}} $
  • B$\sqrt {\frac{{32}}{{17}}} $
  • C$\sqrt 8 $
  • D$\sqrt {\frac{1}{8}} $
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