$13-48$ Consider a hot cylindrical surface and a disk oriented as shown in the figure. Both the cylindrical surface and the disk behave as blackbody. The cylinder has a diameter $D$ and a length $L$ of $0\mathrm{.}2$ m $.$ The disk of diameter $D=0\mathrm{.}2m$ is placed coaxially with the cylinder at a distance of $L=0\mathrm{.}2m$ apart. The cylindrical surface and the disk are maintained at uniform temperatures of $1000$ K and $300$ K $,$ respectively. Determine the rate of heat transfer by radiation from cylindrical surface to the disk.

FIGURE P$13-48$