$$\lambda = v/f$$
where:
* λ is the wavelength in meters
* v is the speed of sound in meters per second
* f is the frequency in Hertz
The speed of sound in air at room temperature (20°C) is approximately 343 m/s. So, the wavelength of a sound wave produced by a guitar string vibrating at 440 Hz is:
$$\lambda = 343 m/s / 440 Hz = 0.78 m$$
Therefore, the wavelength of the sound waves produced by the guitar string is 0.78 meters.