A thin sphere of copper, with its internal surface highly oxidized (e= 0.57), has a diameter of 4 inches. How small a hole must be made in the sphere to make an opening that will have an absorptivity of 0.99

Biochemical Engineering mainly deals with the design, construction, and advancement of unit processes that involve biological organisms (such as fermentation) or organic molecules (often enzymes) and has various applications in areas of interest such as biofuels, food, pharmaceuticals, biotechnology, and water treatment processes. (Source: Wikipedia)