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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 `127^(@)"C"` and temperature of the surrounding is `27^(@)"C"`.

A

`595 J//m xx sec`

B

`595 cal // m xx sec`

C

`991.0 J//m xx sec`

D

`440 J//m xx sec`

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The correct Answer is:
D
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