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				| 1. | A radiator in a domestic heating system operates at a surface temperature of 60 degree Celsius. Calculate the heat flux at the surface of the radiator if it behaves as a black body | 
| A. | 697.2 W/m² | 
| B. | 786.9 W/m² | 
| C. | 324.7 W/m² | 
| D. | 592.1 W/m² | 
| Answer» B. 786.9 W/m² | |