Final answer:
When you increase the volume on your music player, you are increasing the amplitude of the sound waves.
Step-by-step explanation:
When you increase the volume on your music player, you are increasing the amplitude of the sound waves. Amplitude is the dimension of a wave from peak to trough, and in the case of sound waves, it determines the loudness or volume of the sound. Larger amplitude means a louder sound, while smaller amplitude means a softer sound.