Find the energy when radiative heat transfer occurs when a material with a radiative power of $0\mathrm{.}5,$ a heat transfer area of $2[$m$^2],$ and a temperature of $200[]$ is surrounded by a material with a radiative power of $0\mathrm{.}8,$ a heat transfer area of $10[$m$^2],$ and a temperature of $100[].$

The flue gas is at $[].$ If the surface area of $$the thermometer is considerably small compared to the interior area of $$the flue, determine the amount of heat radiated from the thermometer to the flue walls.

When a thermometer was inserted in the center, it showed $200[].$ Meanwhile, the temperature of the sidewalk wall is $100$

$($However$,$ the surface area of $$the temperature is $150[$cm$^2],$ and its emissivity is $0\mathrm{.}9.)$