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- Copper was electroplated from a Cu2SO4 solution onto an electrode with an active surface area of 3.25 cm2. Determine the thickness (mm) of the deposit if the current is kept constant at 4.06 A for 0.9497 hours.Copper was electroplated from a Cu2SO4 solution onto an electrode with an active surface area of 7.4 cm2. Determine the thickness (mm) of the deposit if the current is kept constant at 4.19 A for 1.0808 hours. (density of Cu = 8.96 g/cm3, MW of Cu = 63.55 g/mol).The process of releasing metal atom from the cathode surface in hollow cathode lamp is called a. Atomization b. Vaporization c. Oxidation d. Sputtering