For the diffusion of copper in aluminum, what time will be required at 500C to produce the same diffusion result (in terms of concentration at a specific point) as for 3 h at 600C? Use the diffusion data given in the following Table (if required). Diffusing Species Q.(J/mol) O 87,400 148,000 77,000 168,000 N N Fe Fe' Cu" Al Mg Zn Mo" N' Host Metal D, (m/s) Interstitial Diffusion Fe (a or BCC) 1.1 x 10" Fe (y or FCC) 2.3 x 10-5 Fe (a or BCC) 5.0 x 10- Fe (y or FCC) 9.1 x 10" Self-Diffusion Fe (