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At what temperature (in K) is the speed of sound in helium (ideal gas, γ =...

At what temperature (in K) is the speed of sound in helium (ideal gas, γ = 1.67, atomic mass = 4.003 u) the same as its speed in oxygen 310 m/s? (1 u = 1.66x10-27 kg, k = 1.38x10-23 J/K)

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