Given a wave of a particular wavelength and amplitude, what must be the amplitude, wavelength, and phase change of a wave you add to the existing wave to completely destroy it? The added wave must have the same amplitude, twice the wavelength, and a phase difference of 0 degrees with respect to the original wave. The added wave must have twice the amplitude, the same wavelength, and a phase difference of 180 degrees with respect to the original wave. The added wave must have the same amplitude, the same wavelength, and a phase difference of 180 degrees with respect to the original wave. The added wave must have the same amplitude, the same wavelength, and a phase difference of 0 degrees with respect to the original wave. The added wave must have twice the amplitude, twice the wavelength, and a phase difference of 0 degrees with respect to the original wave