One of your friend is planning to purchase a new oven and he has come to you thinking of you that you are very good in radiative heat transfer. He discussed two model of oven as follow:
Model 1: All six of the oven wall has a dark coating with high value of emissivity 0.95
Model 2: All six of the oven walls are reflective with low value of emissivity 0.15
The manufacturer claims that Model 2 cook food more quickly as compared to Model 1. Both the model has electric resistance heater above the ceiling of both model. The cooking space can be considered cubical with each side of 0.5 m. The top surface has temperature of 200 0C. Comment on manufacturer claim and help your friend.