Carbon is diffused into steel at 900oC over a period of 10 hrs. The solubility of carbon in steel at this temperature is 1.3%. To start with the steel had 0.15% carbon. Find out at what depth a concentration of 1.0% carbon would be present after this diffusion process? D for diffusion at this temperature in steel is 5.9 x 10 -12 m2/s.