What type of light results from the heating of a filament?

When a filament is heated, it emits light due to the thermal radiation produced at high temperatures. This light is typically a mixture of various wavelengths, resulting in the emission of white light.

The process involves the filament reaching temperatures sufficient to produce visible light, and because it generates light across a range of wavelengths, the output consists of multiple frequencies. This is characteristic of incandescent light, where the glowing filament emits light that appears white due to the combination of all the colors in the visible spectrum.

Monochromatic light would only consist of a single wavelength or color, which does not apply to a heated filament, as it emits a broad spectrum of wavelengths. Coherent light refers to light waves that are in phase and have the same frequency, such as those produced by lasers, and is not relevant to the thermal emission of a filament. Polarized light is light in which the waves are aligned in a particular direction, and while some filament light may become polarized upon reflection or transmission, it is not inherently polarized by the process of heating.

Therefore, the light emitted from a heated filament is accurately described as white light consisting of multiple frequencies, making this the correct choice.