Finally an answer to the classic question: "If a tree falls in the forest and there is nobody around does it make a sound?". The answer is: Yes.. and no. At least if you trust Wikipedia.
Yes: "By sound, we commonly mean the vibrations that travel through air and can be heard by humans."
No: "... However, scientists and engineers use a wider definition of sound that includes low and high frequency vibrations in air that cannot be heard by humans, and vibrations that travel through all forms of matter, gases, liquids and solids."
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