A Blacksmith Is Flattening a Steel Plate Having Dimensions 10

Multiple Choice

A blacksmith is flattening a steel plate having dimensions 10 cm × 15 cm × 1 mm.He has heated the plate to 900 K.If the emissivity of the plate is 0.75,at what rate does it lose energy by radiation? Ignore any heat exchange with the surroundings.(σ = 5.67 × 10^-8 W/m² ∙ K⁴)

A) 360 W
B) 760 W
C) 790 W
D) 850 W
E) 880 W