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Calculate the energy radiated in one minute by a blackbody of surface area 200 cm at 127°C. |
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Answer» urface AREA of the black body = 200 cm²Temperature of the black body = 127°C To find:The energy RADIATED from the black body in one MINUTE.Solution:From the Steffan Bolzmann law:Power DISSIPATED by black body P = AξσT⁴Since it is a black body ξ = 1Temperature T = 273+ 127 = 400 KAlso σ = 5.67*10⁻⁸ J/m²sK⁴Therefore P = 200*10⁻⁴ * 1 * 5.67*10⁻⁸ * 400⁴ ≈ 29 J/sWe know that Energy = power×timeEnergy = 29 J/s * 60 s = 1740 JTherefore the energy radiated is one minute will be 1740 J. |
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