Question

Can you hear your own words if you are standing in a perfect vacuum? Can you hear your friend in the same conditions?

Answer 1

When we speak the vocal cords in our throat vibrate. These vibrations reach our ears internally. So even in a perfect vacuum, we can hear our own words.

But in the same conditions, we cannot hear our friend due to the absence of a medium which allows propagating the vibrations from one point to the other.

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