An al-l% cu ingot is solidified with no convection at 3 x 10-4 cm/s, with a thermal gradient of 300°c/cm. solidification is cellular. (see the data in prob. 3-2). 3-6 3-7 3-8 3-9 3-10 3-il (a) what is the approximate liquid composition at the cell tips? the solid composition? (b) what is the temperature of the cell tips? (c) what is the distance from the cell tips to the cell roots? (d) how far does characteristic distance of the diffusion boundary layer extend in front of the cell tips