Consider coaxial, parallel, black disks separated a distance of \(0.20 \mathrm{~m}\). The lower disk of diameter \(0.40 \mathrm{~m}\) is maintained at \(500 \mathrm{~K}\) and the surroundings are at \(310 \mathrm{~K}\).

What temperature will the upper disk of diameter \(0.20 \mathrm{~m}\) achieve if electrical power of \(15 \mathrm{~W}\) is supplied to the heater on the back side of the disk?

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500 K- 0.20 m -Heater 0.40 m 0.20 m