(1a). Black body has emissivity value of 1, but in reality, the emissivity of real objects is less than 1. Why?? (1b). The tungsten sphere of 220 mm radius is at a temperature of 29°C. If the power radiated by sphere is 105 w, calculate its emissivity value? (1c).If the same sphere is enclosed in room whose walls are kept at -9°C, what is the net flow rate of energy out of the sphere in Watts (W)
(1a). Black body has emissivity value of 1, but in reality, the emissivity of real objects is less than 1. Why?? (1b). The tungsten sphere of 220 mm radius is at a temperature of 29°C. If the power radiated by sphere is 105 w, calculate its emissivity value? (1c).If the same sphere is enclosed in room whose walls are kept at -9°C, what is the net flow rate of energy out of the sphere in Watts (W)
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Transcribed Image Text:(1a). Black body has emissivity value of 1, but in
reality, the emissivity of real objects is less than 1.
Why??
(1b). The tungsten sphere of 220 mm radius is at a
temperature of 29°C. If the power radiated by
sphere is 105 W, calculate its emissivity value?
(1c).If the same sphere is enclosed in room whose
walls are kept at -9°C, what is the net flow rate of
energy out of the sphere in Watts (W)
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