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The thermal radiation emited by a body i...

The thermal radiation emited by a body is proportional to `T^(n)` where `T` is its absolute temperature. The value of `n` is exactly 4 for

A

a blackbody

B

all bodies

C

bodies painted black only

D

polished bodies only

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The correct Answer is:
B
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CP SINGH-HEAT TRANSFER-Exercises
  1. A hot body will radiate maximum energy if its surface is

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  2. A black body does not (i) emit radiation (ii) absorb radiation ...

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  3. The thermal radiation emited by a body is proportional to T^(n) where ...

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  4. A spherical black body with a radius of 12 cm radiates 450 watt power ...

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  5. A black body at 227^(@)C radiates heat at the rate of 7 cal cm^(-2) s...

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  6. Two spherical black bodies of radii R(1) and R(2) and with surface tem...

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  7. Two bodies A and B having equal surface areas are maintained at temper...

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  8. Two spheres of radii in the ratio 1 : 2 and densities in the ratio 2 :...

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  9. A piece of charcoal and a piece of shining steel of the same surface a...

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  10. In a dark room with ambient temperature T(0), a black body is kept at ...

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  11. Three very large plates of same area are kept parrallel and close to e...

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  12. A solid at temperature T(1) is kept in an evacuated chamber at tempera...

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  13. A system S receives heat continuously from an electric heater of power...

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  14. A spherical black body of radius r radiates power P, and its rate of c...

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  15. The temperature of an isolated black body falls from T(1) to T(2) in t...

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  16. A solid cube and a solid sphere of the same material have equal surfac...

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  17. A solide sphere and a hollow sphere of the same material and of equal ...

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  18. A sphere at temperature 600 K is placed in an enviroment to temperatur...

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  19. Two metallic spheres S1 and S2 are made of the same material and have ...

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  20. A sphere, a cube and a thin circular plate, all having the same mass a...

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