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 has more to do with the remarkable sensitivity range of our ears than the power of our voice. No matter how weak a sound it *will* move walls a bit. A normal conversation is something like 60 decibels, while 0 decibels is considered the quietest a person can hear. This means that we speak at a volume 1000000 times louder than the quietest thing we can hear. If there’s no other background noise to cover up the quiet voices, that leaves a lot of wiggle room for how muffled a sound can be by the wall while still
being heard.
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