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Every wave obeys v = f x lambda, so the wavelength is speed divided by frequency. Concert A at 440 Hz in air at 343 m/s spans 0.78 m, while the same note in water at 1480 m/s stretches to 3.36 m - the frequency is set by the source but the wavelength is set by the medium.
Wave equation
v = f x lambda, so lambda = v / f
Period
T = 1 / f
Yes. Frequency is fixed by the source, and since sound travels four times faster in water, the wavelength stretches by the same factor.
299,792,458 m/s in vacuum, divided by the refractive index in a medium - about 2.0e8 m/s in glass.