What is the relationship between the wavelength of the fundamental frequency of a tube with open ends and its length, as described by the statement that the wavelength is equal to 4 times the length of the tube?

The relationship between the wavelength of the fundamental frequency of a tube with open ends and its length is described by the statement that the wavelength is equal to 4 times the length of the tube. This means that the wavelength of the sound wave produced in the tube is four times the length of the tube.