Physics

Physics

Problem

Measurements of the total emissive power RR of a near-black surface at three different temperatures are given below. Temperature TT (K): 700, 900, 1100 Measured RR (W m−2\text{W\,m}^{-2}): 1.33×1041.33\times10^{4}, 3.74×1043.74\times10^{4}, 8.25×1048.25\times10^{4} Assuming the surface behaves as an ideal blackbody, which of the following values is the best estimate of the Stefan constant σ\sigma deduced from these readings? a) 5.6×10−5 W m−2 K−45.6\times10^{-5}\,\text{W\,m}^{-2}\,\text{K}^{-4} b) 5.6×10−7 W m−2 K−45.6\times10^{-7}\,\text{W\,m}^{-2}\,\text{K}^{-4} c) 5.6×10−8 W m−2 K−45.6\times10^{-8}\,\text{W\,m}^{-2}\,\text{K}^{-4} d) 5.6×10−4 W m−2 K−45.6\times10^{-4}\,\text{W\,m}^{-2}\,\text{K}^{-4}

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