In a desert stands a 6 meter thick sound barrier, such that if you were surrounded by it on all sides, you would not hear a truck running outside, it is dense concrete in combination with sound absorbing cones. You are standing on one side of the barrier,
(in its shadow) on the other side a truck starts .There are no objects in front of you to reflect the sound of the truck back.
You can hear the truck start. Is this right or wrong, if it is right, how can the ball-and-spring model explain transduction of the wave ? Thx a lot, again, we are assuming here that the barrier is really sound proof, truck motor cannot make it vibrate..
2007-03-26 05:07:32 · 2 answers · asked by kim j 1 in Science & Mathematics ➔ Physics
It's caused by diffraction. The wave from bends around the barrier. There's a wave front model that says when a wave goes around a barrier and gets to the back of the barrier, you treat the model as if there is a source of sound on either side of the barrier.
2007-03-26 05:11:53 · answer #1 · answered by Gene 7 · 1⤊ 1⤋
sound shadow? like... an echo?
2007-03-26 12:15:32 · answer #2 · answered by eveningdin 4 · 0⤊ 0⤋