The filament of an ordinary incandescent electric bulb is made of:

Correct answer: D. Tungsten

Tungsten (W) has a very high melting point, about 3,400 °C, so it can glow white-hot without melting. Nichrome is used in heater coils instead.

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Answer and explanation

The correct answer is D. Tungsten

Tungsten (W) has a very high melting point, about 3,400 °C, so it can glow white-hot without melting. Nichrome is used in heater coils instead.