A cylindrical rod of pure copper has density 8.9×103kgm−3. A longitudinal wave travels along it at 4.7×103ms−1. After alloying with zinc, the density of the rod increases by 4% and the measured wave speed becomes 4.6×103ms−1. Answer the following:
a. (i) Calculate the Young’s modulus of the rod before alloying.
b. (ii) Determine the percentage change in Young’s modulus caused by alloying, correct to two significant figures.