Multiple choice

Which metal is used to make the filament of an electric bulb?

  1. Nichrome

  2. Tungsten

  3. Iron

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Tungsten (W) is used for electric bulb filaments because it has the highest melting point of all metals at approximately 3422°C (6192°F), allowing it to remain solid and emit light at the high temperatures (~2500°C) needed for bright illumination. It also has very low vapor pressure at high temperatures, meaning it doesn't evaporate quickly. Nichrome (nickel-chromium alloy) is used for heating elements, not light bulb filaments. Iron would melt quickly at bulb operating temperatures.

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