How long would it take for a sound impulse to travel through a copper rod 25 kilometers long? the speed of copper is 3,500

0.071 sec
0.14 sec
7.1 sec
140 sec

Although longitudinal waves can travel through all media types what is the disadvantage of this type of wave transmission? a) he efficiency of he wave transmission is greatly diminished as the media becomes less dense b) the oscillation of one set of particles has a huge impact on neighboring particles c) particles become too close together as they bump into each other making it more likely to hit other particles down the line