No, the amplitude of a sound wave does not change if its frequency decreases. The amplitude of a sound wave refers to the maximum displacement of particles in the medium through which the sound is traveling. It represents the loudness or intensity of the sound.
The frequency of a sound wave, on the other hand, refers to the number of complete cycles of the wave that occur per unit of time. It determines the pitch of the sound, with higher frequencies corresponding to higher-pitched sounds and lower frequencies corresponding to lower-pitched sounds.
Changing the frequency of a sound wave does not affect its amplitude. The two properties, amplitude and frequency, are independent of each other. So, if the frequency of a sound wave decreases, the amplitude remains the same, and only the pitch of the sound changes.