## The filament temperature of a light bulb is 1500 K when the bulb delivers 60 W of power. If its emissivity remains constant, what power is d

Question

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## Answers ( )

Answer:The power delivered when the filament temperature is 2000 K is

189.63 W.Explanation:Given;

initial temperature of the light bulb, T₁ = 1500 K

initial power delivered, P₁ = 60 W

Final temperature, T₂ = 2000 K

Final power delivered, P₂ = ?

Apply Stefan-Boltzmann law of radiation;

Therefore, the power delivered when the filament temperature is 2000 K is

189.63 W.