Answer Happy

Question 7 Discuss the use of Planck's law and Wien's displacement law in radiation. The spectral transmissivity of plain and tinted glass can be approximated as follows: 0.3 ≤ ≤ 2.5 μm Plain glass: T₁ = 0.9 Tinted glass: T₁ = 0.9 ≤ 1.5 μm (a) (b) (c) 0.5 ≤ Outside the specified wavelength ranges, the spectral transmissivity is zero for both glasses. Compare the solar energy that could be transmitted through the glasses. Consider a 20-cm-diameter spherical ball at 800 K suspended in air freely. Assuming the ball closely approximates a blackbody, determine (i) the total blackbody emissive power, (ii) the total amount of radiation emitted by the ball in 5 min, and (iii) the spectral blackbody emissive power at a wavelength of 3 µm