Question

Argon rather than air is the gas used in incandescent bulbs because

a) Argon emits a more pleasant light.
b) Argon is cheaper than air.
c) Argon prevents filament oxidation.
d) Argon is easier to produce.

Answer 1

Argon is used in incandescent bulbs because it is an inert gas that prevents the tungsten filament from oxidizing, therefore prolonging the life of the bulb.

Step-by-step explanation:

The reason argon is used in incandescent bulbs is that it prevents filament oxidation. When an incandescent bulb operates, the filament inside the bulb reaches high temperatures. If there were air present, the oxygen would cause the tungsten filament to oxidize, diminishing the filament's life. However, argon, being an inert gas, does not react with the tungsten filament, thereby protecting it. The presence of argon gas ensures a lower rate of evaporation of the filament, less heat conductivity compared to nitrogen, and an overall increase in the lifespan of the bulb.