Shouldn't the vacuum insulate the glass from the heat of the burning filament?

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[–] 2 points 3 years ago (1 child)

If I super heat a metal and it turns visibly red what is happening? Was it already emitting infrared and as it gets hotter the frequency shifts up? Or is it still emitting infrared but has a wider band of frequencies it is emitting as well (i.e. is it emitting frequencies below infrared as well as visible red)?

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