A very long string with linear mass density ยต = 0.500 kg/m is fixed at one end. The other end of the string is pulled with a 20-N force so that the string is tight. If a 1.28-Hz wave propagates along the string, what is the wavelength (in units of meters) of the wave? Keep your answer to 2 decimal places, i.e., X.XX. Do not enter units. If there are trailing zeros in your answer, the system will automatically drop those zeros.