Using an oscilloscope, it can be observed that the pitch of a sound is directly related to a sound wave’s frequency while the volume is directly related to a sound wave’s amplitude. The change shown in the illustration suggests that the

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it shows that the volume is decreasing.

This answer is a pure guess, but I'm 95% sure I'm right but next time attach a picture of the illustration or figure that your needing help with.

Answer:Pitch is decreasing

Explanation:

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