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Q.

An incandescent light bulb has a tungsten filament that is heated to a temperature 3 × 103 K when an electric current passes through it. If the surface area of the filament is approximately 10–4 m2 and it has an emissivity of 0.32, the power radiated by the bulb is

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a

175 W

b

150 W

c

200 W

d

225 W

answer is A.

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Detailed Solution

detailed_solution_thumbnail

According to steffen's law power radiated by body is

P = σeAT4 = (5.67 x 10-8)(0.32)(10-4)(3 x 103)4
=150 W

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