Inert gases like nitrogen and argon are used inside incandescent electric bulbs

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1. Inert gases like nitrogen and argon are used inside incandescent electric bulbs mainly in order to?

Increase the intensity of the light produced

Increase the working life of the filament

Give the emitted light a distinct colour

Make the bulb cheaper to manufacture

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By displacing oxygen inside the bulb, the inert gas fill slows down evaporation of the hot filament, extending its working life considerably.