4. Assuming a filament in a 100 W light bulb acts as a perfect blackbody (e = 1).what is the temperature of the hottest portion of the filament if it has a surfacearea of 6.3 105 m²? The Stefan-Boltzmann constant is 5.67 x 10-8 J/(s. m².K*).a) 130.8 Kb) 1100.21 Kc) 2300.21 Kd) 5800.5 K5. During an evening news broadcast in Helsinki, Finland, the meteorologistindicated that the day's lowest temperature was -6.0 °C. The correspondingvalue of this temperature on the Fahrenheit scale is ........a) -7.2 °Fb) 4.0 °Fc) 21.2 °Fd) 25.5 °F

Use Black body energy radiation formula

Answered: 4. Assuming a filament in a 100 W light…

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