The discussion centers on the rate of electromagnetic (EM) emission based on surface characteristics, specifically comparing black painted surfaces and aluminum plates. Participants highlight that dark matte surfaces exhibit higher emissivity, making them better emitters of EM radiation. The conversation references the Stefan-Boltzmann law to analyze the temperature differences between surfaces and their emissivity. Ultimately, the aluminum plate is considered a significant factor due to its higher temperature, raising questions about the balance between emissivity and temperature in determining EM emission rates.
PREREQUISITESPhysicists, thermal engineers, and researchers interested in thermal radiation and surface characteristics in material science.
And, why do you think that ?druscilla said:I would think the black painted surface is
Right, but the aluminium plate is hotter. So the question is, is the temperature difference enough to overcome the emissivity difference? How will you assess that?druscilla said:Since dark matt surfaces are better emitters of em radiation because of higher emissivity
I think we are supposed to assume those temperatures are maintained somehow.hutchphd said:Also how are these objects being heated? They will not maintain a temperature difference unless differentially heated.
I see no reason to jump to the opposite conclusion.druscilla said:No other variables were stated in the question, so now I think the Al plate must be the answer given Stephan-Boltzmann's law