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The speed of a one-dimensional compressional wave traveling along a thin copper rod is 3.56 ktn/s. The rod is given a sharp hammer blow at one end. A listener at the far end of the rod hears the sound twice, transmitted through the metal and through air, with a time interval Δt between the two pulses, (a) Which sound arrives first? (b) Find the length of the rod as a function of Δt, (c) Find the length of the rod if Δt = 127 ms. (d) Imagine that the copper rod is replaced by another material through which the speed of sound is νr. What is the length of the rod in terms of t and νr? (e) Would the answer to part (d) go to a well-defined limit as the speed of sound in the rod goes to infinity? Explain your answer.
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Chapter 17 Solutions
EBK PHYSICS FOR SCIENTISTS AND ENGINEER
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