Standards for firewalls may be based on their thermal response to a prescribed radiant heat flux. Consider a 0.25-m-thick concrete wall (p = 2300 kg/m3 ? c = 880 J/kg. K, k = 1.4 W/m ? K), which is at an initial temperature of Ti = 25°C and irradiated at one surface by lamps that provide a uniform heat flux of q"s = 104 W/m2. The absorptivity of the surface to the irradiation is a, = 1.0. If building code requirements dictate that the temperatures of the irradiated and back surfaces must not exceed 325°C and 25°C, respectively, after 30 min of heating, win the requirements be met?