It's red hot iron!

Iron glows in red colour when it is heated to very high temperature because:

Heat we supply consumes red colour at high temperature Heat energy is being converted into light energy Mechanical energy is being converted into heat energy None of these choices

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1 solution

Andrew Leung
Dec 19, 2015

All objects with a temperature greater than absolute zero radiate energy in the form of light at various wavelengths. While there is technically no such thing as a perfect blackbody, nearly all objects' radiation can be modeled by the Plank function (https://en.wikipedia.org/wiki/Planck%27s_law) which tells us how much energy is radiated at a given wavelength based on the object's temperature. Essentially, the hotter an object is, the more energy it will radiate at every wavelength .

In the case of this iron bar, its temperature has increased to a point where enough of its radiation is in the visible spectrum to be seen.

But why red?

Vassilis Merekoulias - 2 years, 9 months ago

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