An ordinary light bulb has a rather short life because 1 filament wire is not uniform...........

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An ordinary light bulb has a rather short life because:

1. filament wire is not uniform.

2. bulb cannot be evacuated completely.

3. wires supporting the filament melt at high temperature.

Which of the above statements are correct?

1 and 3

2 and 3

1 and 2

1, 2 and 3

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Explanation:

Antique filament light bulbs, Edison light bulbs, and vintage light bulbs all refer to carbon- or early tungsten-filament lamps. Most of these bulbs are reproductions of the wound filament bulbs made popular by Edison Electric Light Company at the turn of the 20th century. They are easily identified by the long and complicated windings of their internal filaments, and by the very warm-yellow glow of the light they produce (many of the bulbs emit light at a color temperature of 2200-2400K).