Final answer:
The tungsten filament is the part of a light bulb that emits light when heated. It is located in the cathode, which is a negatively charged electrode in the bulb. Tungsten was chosen as the material for the filament because it emits light that appears white.
Step-by-step explanation:
The tungsten filament is the part of a light bulb that emits light when heated. It is located in the cathode, which is a negatively charged electrode in the bulb. Tungsten was chosen as the material for the filament because it emits light that appears white due to containing virtually every frequency of light.