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The surface of a black body is at a temp...

The surface of a black body is at a tempera ture `727^(@)C` and its cross section is `1m^(2)` Heat radi ated from this surface in one minute in Joules is (Stefan's constant `=5.7 xx 10^(-8) W//m^(2)//k^(4))` .

A

`34.2xx10^5`

B

`2.5xx10^5`

C

`3.42xx10^5`

D

`2.5xx10^5`

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The correct Answer is:
A
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TARGET PUBLICATION-KINETIC THEORY OF GASES AND RADIATION -Competitive thinking
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  2. A black body at a temperature of 227^(@)C radiates heat energy at the ...

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  3. The surface of a black body is at a tempera ture 727^(@)C and its cros...

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  4. A metal ball of surface area 200 cm^(2) and temperature 527^(@)C is ...

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  5. A black body of emissive power 81 J/m^(2) s when it is at 300 K and or...

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  9. Two bodies A and B are placed in an evacuated vessel maintained at a t...

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  14. A liquid cools from 70 °C to 60 °C in 5 minutes. If the temperature of...

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  15. An object is cooled from 75 ^(@)Cto 65^(@)C in 2 min in a room at 30^...

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  17. A body cools from a temperature 3 T to 2 T in 10 minutes. The room tem...

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  18. Certain quantity of water cools from 70^(@)C to 60^(@)C in the first 5...

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  20. Two thermometers A and B are exposed in sunlight. The bulb of A is pai...

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