A doubled walled flask may be considered equivalent to two infinite parallel planes. The temperatures at the outer wall is 560K. The space between the walls are evacuated well enough to keep the temperature at the inner wall and 460K. The emissivity of the inner and outer walls are 0.3 and 0.8 respectively. If only the inner wall is replaced by a different material with an emissivity of 0.4, will it lead to the reduction of the heat flux to a third? Show complete calculations to back-up your conclusion