3. An incandescent lamp filament, with a surface area of 100mm², operates at a temperature of 2300°c. Assume that the filament acts like a blackbody (e = 1). (a) If the walls of the room in which the lamp operates are at 27°C, what is the rate at which the filament absorbs radiation? (b) At what rate does electrical energy have to be supplied to the filament to keep its temperature constant? (Ignore conduction and convection losses from the filament.) Hint: A black body or blackbody is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence (https://en.wikipedia.org/wiki/Black body). a) solve for P but instead of using P = oeAT* if we are to consider recipient temp then P = oeA(Tource- Trecipient) b) just use P = oeAT" ignore given at a).
3. An incandescent lamp filament, with a surface area of 100mm², operates at a temperature of 2300°c. Assume that the filament acts like a blackbody (e = 1). (a) If the walls of the room in which the lamp operates are at 27°C, what is the rate at which the filament absorbs radiation? (b) At what rate does electrical energy have to be supplied to the filament to keep its temperature constant? (Ignore conduction and convection losses from the filament.) Hint: A black body or blackbody is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence (https://en.wikipedia.org/wiki/Black body). a) solve for P but instead of using P = oeAT* if we are to consider recipient temp then P = oeA(Tource- Trecipient) b) just use P = oeAT" ignore given at a).
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Transcribed Image Text:3. An incandescent lamp filament, with a surface area of 100mm2, operates at a temperature of 2300°C.
Assume that the filament acts like a blackbody (e = 1).
(a) If the walls of the room in which the lamp operates are at 27°C, what is the rate at which the filament
absorbs radiation?
(b) At what rate does electrical energy have to be supplied to the filament to keep its temperature
constant? (Ignore conduction and convection losses from the filament.)
Hint:
A black body or blackbody is an idealized physical body that absorbs all incident electromagnetic
radiation, regardless of frequency or angle of incidence (https://en.wikipedia.org/wiki/Black body).
a) solve for P but instead of using P = oeAT* if we are to consider recipient temp then
P = oeA(Tource - Tecipient)
b) just use P = oeAT" ignore given at a).
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