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The emissivity of black body is equal to...

The emissivity of black body is equal to

A

4

B

3

C

2

D

1

Text Solution

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The correct Answer is:
D
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MBD PUBLICATION-THERMAL PROPERTIES OF MATTER (HEAT TRANSFER)-QUESTION BANK
  1. Example of diathermanous body is

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  2. What is the sum of co-efficient of absorption, reflection and transmis...

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  3. The emissivity of black body is equal to

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  4. Good conductor of heat and current is :

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  5. The co-efficient of absorption and reflection of a thin uniform plate ...

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  6. The co-efficient of reflection, coefficient of absorption and coeffici...

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  7. If an athermous body absorbs 20% of the incident radiant energy then r...

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  8. A rate of radiation of a perfectly black body at 0^@ C is X j/sec. Th...

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  9. A spherical black body with a radius of 12 cm radiates 450 W power at ...

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  10. A metal cube of each side 0.05 m long emits 0.6 kcal in 80 second. The...

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  11. A perfectly black body emits total energy of 5 xx 10^2 joules in 50 mi...

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  12. A surface has emissive power 2.4 xx 10^(-2) watt/m^2 and perfectly bla...

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

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

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

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

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  17. Ratio of emissive power of perfectly black

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

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

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

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