Which two sources are classified as types of visible electric light?

The classification of visible electric light sources includes those that emit light through various mechanisms, and incandescent and gaseous discharge lamps are significant examples of this.

Incandescent light sources work by passing electrical current through a filament, which then heats up and emits visible light. This effect is commonly seen in traditional light bulbs, where the filament glows brightly in response to the electrical current. The light produced is continuous and broad-spectrum, making it very visible to the human eye.

Gaseous discharge lamps, which include types like neon lights and fluorescent tubes, generate light by sending an electrical discharge through a gas, which then emits light. In fluorescent lamps, for example, the discharge excites mercury vapor and produces ultraviolet light, which then stimulates a phosphor coating inside the tube to emit visible light.

Both incandescent and gaseous discharge light sources operate with specific mechanisms that make them key examples of visible electric light. This classification emphasizes the different technologies that help produce illumination in various applications.

It's worth noting that while the other options include credible types of visible light sources, they may not represent the classic distinctions between incandescent and specific gaseous discharge technologies.