Answer to Question #44320 in Molecular Physics | Thermodynamics for gajendra

Question

if two bulb one is black painted and one is white then which bulb high heat produced

Answer 1

A white object reflects all wavelengthswith equal efficiency (that's what makes it white), which means it does not absorb any wavelengths, and so must not emit any wavelengths (if it is perfectly white). On the other hand, a black body absorbs all wavelengths completely and does not reflect any (that is what makes it black), so it must emit all wavelengths equally efficiently.

That’s why black painted bulb produces moreheat than white bulb (black color have a good ability to emitthermal radiation, white color have a poor ability to emit thermal radiation).