The ratio of the velocity of sound in hydrogen gas $(\gamma = 7/5)$ to that in helium gas $(\gamma = 5/3)$ at the same temperature will be
  • A$\sqrt {42} / 5$
  • B$\sqrt {21} / 5$
  • C$\sqrt {7 / 3}$
  • D$\sqrt {3 / 7}$
Medium
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