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A very small hole in an electric furnanc...

A very small hole in an electric furnance is used for heating metals . The hole nearly acts as a black body . The area of the hole is `200 mm^(2)`. To keep a metal at `727^@C` , heat energy flowing through this hole per sec, in joules is (`sigma= 5.67 xx 10^(-8)Wm^(-2)K^(-4)`)

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A very small hole in an electric furnace is used for heating metals. The hole nearly acts as black body. The area of the hole is 200mm^(2) To keep a metal at 727^(@)C heat energy flowing through this hole per sec in joules is (sigma =5.67 xx 10^(-8)Wm^(-2)K^(-4)) .

A very small hole in an electric furnace is used for heating metals. The hole nearly acts as black body. The area of the hole is 200mm^(2) To keep a metal at 727^(@)C heat energy flowing throungh this hole per sec in joules is (sigam =5.67 xx 10^(-8)Wm^(-2)K^(-4)) .

The surface area of a black body is 5xx10^(-4) m^(2) and its temperature is 727^@C . Energy radiated by it per minute is (Take sigma =5.67xx10^(-8) "J m"^(-2) s^(-1) K^(-4) )

The surface area of a black body is 5xx10^(-4) m^(2) and its temperature is 727^@C . Energy radiated by it per minute is (Take sigma =5.67xx10^(-8) "J m"^(-2) s^(-1) K^(-4) )

The power of black body at temperature 200 K is 544 W .Its surface area is (sigma=5.67xx10^(-8)Wm^(-2)K^(-2))