If you double the amplitude of a sound wave while keeping its frequency constant, the wavelength of the sound wave will remain constant.
The amplitude of a sound wave represents the maximum displacement or intensity of the wave, whereas the wavelength represents the distance between two consecutive points in the wave that are in phase with each other. Changing the amplitude of a sound wave does not affect the distance between these points, which is determined solely by the frequency of the wave.
Therefore, increasing or decreasing the amplitude of a sound wave does not alter its wavelength. The only effect it has is on the intensity or magnitude of the wave.