Incandescent Light Bulbs Eventually Burn Out Because the High Temperature

question 301

Multiple Choice

Incandescent light bulbs eventually burn out because the high temperature of the filament causes tungsten atoms to fly off and collect on the inside of the bulb's glass. This loss of tungsten is slowed, but not prevented, by introducing argon inside the bulb's envelope. As more and more atoms are lost, the filament disintegrates. When this happens, no electricity flows through the filament, and the bulb produces no light.

• A) Argument; conclusion: Incandescent light bulbs eventually burn out.
• B) Argument; conclusion: The high temperature of the filament ... the bulb's glass.
• C) Argument; conclusion: The filament disintegrates.
• D) Argument; conclusion: When this happens ... the bulb produces no light.
• E) Nonargument.

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Contradictories

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