An 80.0-m-long brass rod is struck at one end. A person at the other end hears two sounds as a result of two longitudinal waves, one traveling in the metal rod and the other traveling in the air.
What is the time interval between the two sounds? Take the speed of sound in air to be 344m/s. Use 8600kg/m3 for the density of brass and 9.00×109Pa for the Young's modulus of brass.