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At a certain temperature for given wavel...

At a certain temperature for given wavelength, the ratio of emissive power of a body to emmisve power of black body in same circumstance in known as

A

relative emissivity

B

emmissivity

C

absorption coefficient

D

coefficient of reflection

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The correct Answer is:
B
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CP SINGH-HEAT TRANSFER-Exercises
  1. Which of the following law states that "good absorbers of heat are goo...

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  2. For a perfectly black body, its abosrpitve power is

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  3. At a certain temperature for given wavelength, the ratio of emissive p...

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

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  5. An ideal Black-body at room temperature is thrown into a furnace. It i...

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  6. A hot body will radiate maximum energy if its surface is

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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