When the filament of an electric bulb is first switched on

PHYSICS · Subjective · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter

Problem

When the filament of an electric bulb is first switched on, it glows a dull red; after a few seconds it appears bright white. Explain this change in colour in terms of the behaviour of a blackbody spectrum with temperature.

Related theory

Browse the problem library