The Tungsten Filament of a Light Bulb Has an Operating

question 50

Multiple Choice

The tungsten filament of a light bulb has an operating temperature of about 2100 K.If the emitting area of the filament is 0.80 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) 100 W
• B) 75 W
• C) 60 W
• D) 40 W

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Definitions:

Selective Forces

Factors in the environment that influence the reproductive success of organisms, driving the process of natural selection and evolutionary change.

Brain Size

The physical volume or mass of the brain, often associated with cognitive abilities and intelligence across different species.

Genetic Diversity

The total number of genetic characteristics in the genetic makeup of a species, contributing to its ability to adapt to its environment.

Founder Effect

A form of genetic drift where a new population is established by a very small number of individuals, leading to reduced genetic variation from the original population.