When a tree fell down in the forest, there was a loud noise, but no one was in the virgin forest, so the sound was not heard. Does this count as a sound coming out? The sound is definitely coming out, because when tree trunks and branches touch the ground, they all produce certain sounds, but no one hears them, but the sounds are heard by humans or other animals. It is different, so this is what is called Psychoacoustics acoustically.
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