[Potironette]

Oh wow! That's really cool what a sound wave is! But since it's from atoms hitting all the way to the other side, does that mean when someone knocks on a door, the person inside the room hears it louder than the person outside (assuming that the person inside just happens to be right at the door)?

And by sound "in" an object you mean it's because the atoms are in the object?


From what I remember, friction happens because of temporary dipoles..and those cause a sticky effect between objects. Buut why does electrical resistance occur? From too many electrons bumping into each other o_o?