2007-01-15 17:10:23 · 4 answers · asked by Ganesh 1 in Science & Mathematics ➔ Physics
The sounds in the room all reach the cup, and the cup acts as an amplifier of those sounds. Like speaking into a megaphone or a tube makes the sound louder. Thats why people put one up to a door to listen into another room.
2007-01-15 17:14:10 · answer #1 · answered by Mickey Mouse Spears 7 · 0⤊ 0⤋
its all about sound waves....they can travel through all sorts of things....and that nice air space in the cup helps transmit the sound...now, if you could make the space inside the cup a vacuum, and cancel out the effect of sound waves that you pick up with your body (plug your ears...your still hearing noises)....you'd really cut down on your ability to hear anything. Or even better, stick yourself in a vacuum...you'd hear nothing...not even yourself exploding : )
2007-01-16 01:18:28 · answer #2 · answered by oneman c 2 · 0⤊ 0⤋
it's the outside noises, amplified and filtered down to certain frequencies that pass through the cup walls.
2007-01-16 01:16:36 · answer #3 · answered by Anonymous · 0⤊ 0⤋
ambient noise bounces around the cup until it lands in your ear...sounds a bit echoy and hollow
2007-01-16 01:18:47 · answer #4 · answered by Anonymous · 0⤊ 0⤋