The surface of an iron component is to be hardened by carbon. The diffusion coefficient of carbon in iron at 1000ºC is given to be 3×10-11 m2/s. If the penetration depth of carbon in iron is desired to be 1.0 mm, the hardening process must take at least
(a) 1.10 h
(b) 1.47 h
(c) 1.86 h
(d) 2.50 h
(e) 2.95 h
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