If a body coated black at 600K surrounded by atmosphere at 300 K has cooling rate r_(0), the same body at 900 K, surrounded by the same atmosphere, will have cooling rate equal to

If a body coated black at 600K surrounded by atmosphere at 300 K has c

1.	If a body coated black at 600K surrounded by atmosphere at 300 K has cooling rate r_(0), the same body at 900 K, surrounded by the same atmosphere, will have cooling rate equal to
Answer» `16/3 r_(0)` `8/16 r_(0)` `16 r_(0)` `4 r_(0)` Solution :Cooling RATE `ALPHA T^(4)-T_(0)^(4)` `r = {((900)^(4)-(300)^(4))/((600)^(4)-(300)^(4))}r_(0) = 16/3r_(0)`