When a blackened platinum wire is heated gradualiy, it...

When a blackened platinum wire is heated gradualiy, it appears?
(a) first blue, then red and finally white
(b) first red, then blue and finally white
(c) first white, then blue and finally red
(d) first red, then white and finally blue

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Key Concepts

Surface Oxidation in Metals

Surface oxidation in metals involves the formation of an oxide layer when the metal reacts with oxygen. In the context of heated metal wires, this oxide layer can influence the apparent color of the metal. As the metal is gradually heated, the properties of the oxide layer may change—such as being removed or decomposed—resulting in distinct observable color transitions that reflect both the temperature change and the chemical state of the surface.

Incandescence

Incandescence is the emission of light from a material due to its high temperature. As an object is heated, its atoms and electrons become excited, and as they return to lower energy states, they release energy in the form of light. This phenomenon is fundamental in understanding why objects change color as they heat up, typically first glowing red at lower temperatures and brighter or whiter as the temperature increases.

Black-Body Radiation

Black-body radiation refers to the theoretical emission spectrum of an object that absorbs all incident radiation and re-emits energy based solely on its temperature. The spectrum follows a predictable pattern where the peak wavelength shifts to shorter (bluer) wavelengths as the temperature increases. This concept is essential for understanding the temperature-dependent color changes observed in heated objects.

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