Assuming a Filament in a 100 W Light Bulb Acts

question 12

Multiple Choice

Assuming a filament in a 100 W light bulb acts like a perfect blackbody,what is the temperature of the hottest portion of the filament if it has a surface area of 6.3 × 10^-⁵ m²? The Stefan-Boltzmann constant is 5.67 × 10^-⁸ W/(m² · K²) .

• A)130 K
• B)1100 K
• C)2300 K
• D)5800 K
• E)30 000 K

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Definitions:

Current Flow

The movement of electric charge through a conductor, typically measured in amperes.

Series Circuit

An electrical circuit in which components are connected end-to-end, forming a single path for current flow.

Wool Sweater

A clothing item knitted from wool yarn, known for its warmth and moisture-wicking properties.

Magnetomotive Force

The force that drives magnetic flux through a magnetic circuit, analogous to electromotive force in an electrical circuit.