Incandescent lighting is described as

Incandescent lighting is described as

• A. It glows due to chemical reactions
• B. It glows due to heat
• C. It is produced by fluorescence
• D. It uses ambient light rather than emitting light

Answer: (B)

Incandescent lighting works by heating a filament until it glows, so light is produced as a result of high temperature. The electric current heats the filament, usually tungsten, to thousands of degrees, and the hot filament emits visible light as thermal radiation. This is different from light produced by chemical reactions or by fluorescence, and it isn’t simply reflecting ambient light. The glow comes from the filament itself, not from external light sources.

Incandescent lighting works by heating a filament until it glows, so light is produced as a result of high temperature. The electric current heats the filament, usually tungsten, to thousands of degrees, and the hot filament emits visible light as thermal radiation. This is different from light produced by chemical reactions or by fluorescence, and it isn’t simply reflecting ambient light. The glow comes from the filament itself, not from external light sources.