Why a black body at 1000K is red hot whereas it is white hot at 2000K.

Red hot: 1000K, the peak wavelength emitted by a black body falls in visible red range making the black body appear red hot.

White Hot: At 2000K, the black body produces a mixture of peak wavelengths with colors in the visible spectrum including red, yellow, green, and blue, which combine to produce white light. Thus, the black body appears white hot.

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Dr. Bbosa Science