Athick wood slab = 0.2 w/m. k and = 1.28 × 10−7 m2 /s) that is initially at a uniform temperature of 25°c is exposed to hot gases at 550°c for a period of 300 sec. as a results of the process, the wood slab is continuously being heated supplied with a heat flux of 13 kw/m2 . if the ignition temperature of wood is 450°c, determine if the wood will ignite.