Suppose we have a cube, of length 1 metre. It is cut in all the three directions so that 8 cubes, each having 0.5 m as its length. Then, these cubes are again subdivided in the same manner to get cubes with length 0.25m and so on. HOW MANY OF THESE SUCCESSIVE SUBDIVISIONS ARE REQUIRED BEFORE THE SIZE OF THE CUBES IS REDUCED TO THE SIZE OF COLLOIDAL PARTICLES, which is 100 nm??