Question

an incandescent light has a ______ spectra. variable line continuous all of the above

Explanation:

Incandescent light bulbs produce light by heating a filament until it glows. This process emits light across a wide range of wavelengths without any gaps, which is characteristic of a continuous spectrum. A line spectrum has discrete lines at specific wavelengths (e.g., from excited gases), and "variable" is not a standard type of spectrum classification in this context. Since it's not a line or variable spectrum, "All of the above" is incorrect.

Answer:

continuous