A spherical ball at 800 K suspended in air consider the ball to be a black body and its diameter is 20 cm. calculate the spectral blackbody emissive power (in W/m2. μm) at a wavelength of 3 μm. Where constant C1 = 3.743 × 108 W-μm4/m2 and C2 = 1.4387 × 104 μm.K.
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