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A black body, at a temperature of 227^@C...

A black body, at a temperature of `227^@C`, radiates heat at a rate of 20 cal `m^(-2)s^(-1)`. When its temperature is raised to `727^@C`, the heat radiated by it in cal `M^(-2)s^(-1)` will be closest to

A

40

B

160

C

320

D

640

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SL ARORA-Thermal Properties of Matter-Exercise
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  5. Statement I: The bulb of one thermometer is spherical while that of th...

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  6. On a cold morning, a metal surface will feel colder to touch than a wo...

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  7. Assertion : Woollen clothes keep the body warm in winter Reason : Ai...

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  8. Heat travels through vaccum by

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  9. The amount of radiation emitted by a perfectly black body is proportio...

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  10. The unit of thermal conductivity is :

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  11. A rod AB is 1m long. The temperature of its one end A is maintained at...

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  12. The reezer in a refrigeratror is located at the top section so that

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  13. Three objects coloured black, gray and white can withstand hostile con...

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  14. If the amount of heat energy received per unit area from the Sun is me...

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  15. A black body is at a temperature 300 K. It emits energy at a rate, whi...

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  16. If temperature of a black body increases from 7^(@)C to 287^(@)C , the...

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  17. A black body is heated from 27^(@)C to 127^(@)C. The ratio of their en...

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  18. The rate of dissipation of heat by a black body at temperature T is Q....

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  19. A copper ball 2 cm in radius is heated in a furnace at 327^@C If its e...

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  20. A black body, at a temperature of 227^@C, radiates heat at a rate of 2...

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