Heat And Thermodynamics

Three discs \(\mathrm{x}, \mathrm{y}\) and \(\mathrm{z}\) having radii \(2 \mathrm{~m}, 3 \mathrm{~m}\) and \(6 \mathrm{~m}\) respectively are coated on outer surfaces. The wavelength corresponding to maximum intensity are \(300 \mathrm{~nm}, 400 \mathrm{~nm}\) and \(500 \mathrm{~nm}\) respectively. If \(\mathrm{P}_{\mathrm{x}}, \mathrm{P}_{\mathrm{y}}\) and \(\mathrm{P}_{\mathrm{z}}\) are power radiated by them respectively then