Answer:
The density of water vapour is less than that of air. So the density of air mixed with water vapour (moist air) is less than that of dry air. Hence the speed of sound in moist air, is greater than that in dry air \[(\upsilon \propto 1/\sqrt{\rho })\]. However, the density of water vapour is more than that of hydrogen, so the density of moist hydrogen is more than that of dry hydrogen. Consequently, the speed of sound in moist hydrogen is less than that in dry hydrogen.
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