An Electric Current Through a Tungsten Filament Maintains Its Temperature

question 5

Multiple Choice

An electric current through a tungsten filament maintains its temperature at 2800 K. Assume the tungsten filament behaves as an ideal radiator at that temperature. If the radiating area of the filament is 2.0 × 10^-6 m², at what rate does it radiate energy? (σ = 5.670 × 10^-8 W/m² ∙ K⁴, Wien displacement law constant is 2.90 × 10^-3 m ∙ K)

• A) 5.5 W
• B) 7.0 W
• C) 8.5 W
• D) 10 W
• E) 11.5 W

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Definitions:

Dense Regular

Connective tissue characterized by tightly packed collagen fibers aligned in a parallel arrangement, providing strength in one direction.

Protein Fibers

Long, string-like structures composed of proteins that play various roles in the cell, including providing support, shape, and enabling movement.

Ground Substance

The amorphous, gel-like substance surrounding cellular components in connective tissue, providing support and mediating communication between cells.

Extracellular Material

Substances found outside cells, including proteins, salts, and water, that provide structural and biochemical support to surrounding cells.