In an electric bulb, light is produced due to the glowing of (a) the glass case of the bulb (b) the thin filament (c) the thick wires supporting the filament (d) gases inside glass case of the bulb.

b) The thin filament.

Explanation

There is a thin filament present inside a bulb that glows and produces light.

The light bulb consists of three key parts

  • The filament
  • The glass bulb
  • The base of the light bulb

The filament which is a coiled thin wire is made of tungsten. Tungsten is chosen as filament since it has a high melting point, which avoids the melting of the filament at high temperatures.

The filament is enclosed in a globe-shaped glass mount and is connected with copper and lead wires which are connected to the base of the lamp. The wires and the filament are enclosed in a glass bulb, which is filled with an inert gas like argon. Since argon is an inactive gas, it protects the filament from burning as well as increasing the lifetime of the filament. Thin glass is used to manufacture the bulb, this glass prevents the air from reaching the filament to protect it from burning.

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