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A 100-W incandescent light bulb has a cylindrical tungsten filament 26.0 cm long, 0.35 mm in...

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Physics

A 100-W incandescent light bulb has a cylindrical tungstenfilament 26.0 cm long, 0.35 mm in diameter, and with an emissivityof 0.28.

(A) What is the temperature of the filament?

(B) For what wavelength does the spectral emittance of the bulbpeak?

(C) Incandescent light bulbs are not very efficient sources ofvisible light. Explain why this is so.

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