The tungsten filament of a lightbulb has an operating temperature of about 2700

Question

The tungsten filament of a lightbulb has an operating temperature of about 2700 degree C when the room temperature is 20 degree C. If the emitting area of the filament is 1.1 cm^2, and its emissivity is 0.6, what is the power output of the lightbulb? (Stephan-Boltzmann Constant = 5.67 times 10^-8 W/m^2 K^4) 16.2 Watts 276.21 Watts 37.26 Watts 49.5 Watts 29.23 Watts What is the entropy change for 7 moles of a polyatomic ideal gas isobaric process from 23 degree C to 100 degree C? 53.83 J/K 19.3 J/K 161 J/K 48.3 J/K 70 J/K

Explanation / Answer

5)

Power output of bulb = sigma * A *Emissivity * T4

Power output of bulb = (5.67 *10^-8 )(0.011) 2 * 0.6 *(2700)4

Power output of bulb = 276.21 W

(Option B)

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