Three identical metal plates are coated as follows and kept at the same temperature:…
PHYSICS · Single correct · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter
Problem
Three identical metal plates are coated as follows and kept at the same temperature:
P: matte black coating with aλ=0.95
Q: white paint coating with aλ=0.25
R: highly polished aluminium with aλ=0.05
Which plate will appear brightest (largest infrared intensity) on a thermal camera sensitive to wavelength λ?
(a) Plate R (polished aluminium)
(b) Plate P (matte black)
(c) All three plates appear equally bright
(d) Plate Q (white paint)