The Tungsten Filament of a Light Bulb Has an Operating

question 26

Multiple Choice

The tungsten filament of a light bulb has an operating temperature of about 2 050 K.If the emitting area of the filament is 0.70 cm²,and its emissivity is 0.68,what is the power output of the light bulb? (σ = 5.67 × 10−⁸ W/m²⋅K⁴)

• A)70.1 W
• B)47.7 W
• C)477 W
• D)42.7 W
• E)39.7 W

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Definitions:

Aortic Arches

The series of curved blood vessels that diverge from the top of the heart; vital in the arterial blood circulation system.

Arthropods

A large phylum of invertebrate animals with exoskeletons, segmented bodies, and jointed appendages, including insects, arachnids, and crustaceans.

Jointed Appendages

Body parts, such as limbs or antenna, that are composed of segments connected in such a way that they can move.

Molting

The process by which animals shed their outer layer, such as skin or feathers, to allow for growth or to replace worn tissues.