The top of an insulated cylindrical cont...

The top of an insulated cylindrical container is covered by a disc having emissivity 0.6 and conductivity 0.167 `"WK"^(– 1)m^(–1)` and thickness 1 cm. The temperature is maintained by circulating oil as shown in figure. Find the radiation loss to the surrounding in `"Jm"^(–2)s^(–1 )`if temperature of the upper surface of the disc is `27^(@)"C"` and temperature of the surrounding is `27^(@)"C"`.

`595 "Jm"^(-2)"s"^(-1)`

`5545 "Jm"^(-2)"s"^(-1)`

`495 "Jm"^(-2)"s"^(-1)`

none of these

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