Q3. The cladding (outside layers) of a cylindrical coin consists of an alloy of 75wt% copper and 25 wt \% nickel. Total: 25 (pts) a) What is an alloy? b) What are the atomic percent Cu and atomic percent Ni contents of this material? Molecular Weight of Cu: 63.54g/mol; Molecular Weight of Ni:58.69g/mol; Density of Cu: 8.96g/cm3; Density of Ni:8.908g/cm3 c) Briefly discuss a suitable characterization tool to probe the surface elemental composition of the alloy. LO:Choose the appropriate characterization method for analyzing material structure-e.g. microstructure, grain, crystal structure, electronic structure, molecular bonds