Physical science question... need help!

Question

The filament in a lightbulb provides a demonstration of which phenomenon?
A. Emission spectra

B. Quantum mechanics

C. Photoelectric effect

D. Blackbody radiation

Answer 1

Short answer is Blackbody radiation: this is the light given off when something gets hot.  For example the heating element on a stove glows red-orange when it is on high; the light bulb is the same thing, it is just hotter so the light is 'whiter'.