I have neighbours above and below my flat and every time something, even as small as a pin, drops on the floor upstairs I can hear it in my room with the door shut. Downstairs, there is a boy who likes to shoot a tennis ball at their ceiling( my floor level) but I have never heard the sound of the ball hitting the ceiling. While at the boy's flat one day I noticed that the ball made considarable noise much more than a dropt pin. In my previous flat I always heard noise from upstairs too. Now, back in my room, my head is about the same distance away from the floor as it is from the ceiling. I do not hear the noise from the ball hitting the ceiling downstairs, but that of a dropt pin on the floor upstairs. Does it mean that the noise/sound is heavy so that gravity pulls the sound of the ball downwards and I can therefore not hear it in my room? If this is true why do our cel phone calls go through despite the fact that they have to reach the transmiters against gravity?
2007-10-30
04:36:50
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5 answers
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asked by
Sheng Lee
2
in
Science & Mathematics
➔ Physics