General Science • PhysicsMedium
What is the primary reason why incandescent light bulbs are filled with an inactive gas like argon or nitrogen instead of being left under vacuum?
A. To increase the filament resistance significantly
B. To prevent the rapid evaporation and oxidation of the tungsten filament✓ Correct Answer
C. To enhance the emission of ultraviolet radiation
D. To produce colorful decorative glow effects inside the bulb
💡 Solution & Explanation
Incandescent bulbs are filled with inert gases such as argon or nitrogen to suppress the vaporization of the hot tungsten filament at high operating temperatures, thereby extending bulb lifespan. A vacuum would cause the tungsten atoms to sublimate rapidly and deposit on the inner glass surface. Nitrogen and argon molecules collide with evaporating tungsten atoms and knock them back onto the filament.
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