A small surface of area A 1 = 5 cm 2 emits radiation as a blackbody at

Question:

A small surface of area A₁ = 5 cm² emits radiation as a blackbody at T₁ = 1000 K. A radiation sensor of area A₂= 3 cm² is placed normal to the direction of viewing from surface A₁ at a distance L. An optical filter with the following spectral transmissivity is placed in front of the sensor: - ST = 0, = 0.5, 0 = < 2 m 2 m = < *