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superinsulators do not allow heat to flow through them along with electricity, it will be dimmer than A when heated to 1000 degrees which is contrary to the question, B appears to be a perfect emitter of heat (this is one hell of a hint)
I can not avoid to think about coal, but you said that a material is not the answer. So I can only think about a black body, but thought that was too abstract, like saying "absorber", which wasn't the answer. Let me think...
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50 sats \ 1 reply \ @noknees OP 15h
you got it!
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WooHoo!!! Awesome!! :D
Thank you again for the bounty :D
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