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Applied physics (lighting): The filament material of a typical incandescent electric bulb. Consider high melting point, strength at high temperature, and emissivity. Choose the correct material.

Q: Applied physics (lighting): The filament material of a typical incandescent electric bulb. Consider high melting point, strength at high temperature, and emissivity. Choose the correct material.

Given data Ask: Filament material for incandescent bulbs. Concept/Approach Tungsten (melting point ≈ 3422 °C) withstands high temperatures and has suitable mechanical properties when coiled, making it standard for filaments. Final Answer Tungsten

Difficulty: Easy

Tungsten
Nichrome
Graphite
Iron

Correct Answer: Tungsten

Explanation:

Given data

Ask: Filament material for incandescent bulbs.

Concept/Approach
Tungsten (melting point ≈ 3422 °C) withstands high temperatures and has suitable mechanical properties when coiled, making it standard for filaments.

Final Answer
Tungsten

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