A shock wave from an explosion travels at Mach 3 towards a building. The shock reflects from the building wall and travels back in the direction it came from. There is a pile of firewood outside the building that experiences both the incident and reflected shocks. You can treat both as normal shocks. Given the wood has an auto-ignition temperature of 800K (i. e., the temperature at which it will spontaneously ignite), does the wood ignite? When does it ignite (i. e., after the passage of the first shock or the second shock or never?) Before the explosion happened the conditions near the building are 300K and 1 atm pressure.