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Wavelength lambda and frequency f are connected by the speed c of the medium.

c can be air = 343 m/s at 20 degrees celsius or water at 0 dgrees = 1450 m/s.

c can be light waves or electromagnetic waves = 299 792 458 m/s.

The formulas are:

c = lambda x f - That is frequency times wavelength.

f = c / lambda

lambda = c / f

frequency is nu so the equation is actually c= lamda x nu
That could be the speed of sound or the speed of light. c = f times lambda

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