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Ratio of rate of radiation of heat of a ...

Ratio of rate of radiation of heat of a body at `227^@C` to that of the same body at `27^@C` is

A

25 : 9

B

5 : 3

C

125 : 27

D

625 : 81

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The correct Answer is:
D
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MBD PUBLICATION-THERMAL PROPERTIES OF MATTER (HEAT TRANSFER)-QUESTION BANK
  1. A surface has emissive power 2.4 xx 10^(-2) watt/m^2 and perfectly bla...

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  2. Emissive power of a perfectly black body at 227^@ C is Eb. Emissive po...

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  3. Ratio of rate of radiation of heat of a body at 227^@C to that of the ...

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  4. Compare the rate of radiation of heat of a body at 327^@C with the rat...

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  5. The temperature of a piece of metal is raised from 27^@C to 327^@C. Th...

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  6. Ratio of emissive power of perfectly black

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  7. The temperature of a piece of metal is raised from 27^@C to 84^@C. The...

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  8. A black body at a temprature of 227^@C radiates heat at the rate of 5 ...

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  9. A baby radiates heat at the rate of 50 J/s when at 300^@K. When the sa...

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  10. Sphere of radius 5 cm at temperatures 127^@C (Stefan's constant = 5.7 ...

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  11. The energy radiated by a 100 kW transmitter in 1 hour is

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  12. The amount of heat radiated pr unit time, per unit area by perfectly b...

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  13. If a body having a surface area 5 cm^2 and a temperature of 727^@C rad...

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  14. If the temperature of the body is increased by 500^@K, the radiation e...

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  15. 10g of ice at 0^@C is mixed thoroughly with 50g of water at 10^@C. The...

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  16. A perfectly black bloody radiates 81j/sec at 300^@K. The amount of ene...

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  17. A rectangular brass plate of sides 15 cm and 8cm and thickness 0.8cm h...

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  18. Total area of glass - planes of the window in a room is 10 m^2 and thi...

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  19. A metal rod 25 cm long and 10sq cm in cross section has it's one end p...

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  20. A wooden ice box contains ice at 0^@ C . The inner dimensions of the b...

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