I understand how sound waves work and how humans perceive sound. I don’t understand how a persons speaking normally has enough to power to vibrate something as solid as a wall to the point that we may even discern what someone is saying.
In: Physics
This is largely about how thin walls are. You can’t really talk through a brick wall, but interior walls are often made of thin, vibratable stuff like wallboard or plaster. And part of exterior walls is glass (windows), also easy to vibrate.
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