The relationship between frequency, wavelength, and speed of a wave is given by the formula:
wavelength = speed / frequency
In this case, the frequency is 125 Hz and the speed is 5000 m/s. Substituting these values into the formula:
wavelength = 5000 m/s / 125 Hz
Simplifying the expression:
wavelength = 40 m
Therefore, the wavelength of the sound wave is 40 meters.