What is the evidence that sound is a form of energy?
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The sound waves are a kind of energy because they can do work.
For example, if we look closer on speakers drum, we can see the vibration of it. That vibration is made by sound so sound is a kind of energy.
Or when you fall something, it hits the ground and we can hear the sound. So falling is a work, sound heard from the hit, is result of that work.