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Three objects coloured black, gray and w...

Three objects coloured black, gray and white can withstand hostile conditions upto `2800^(@)C`. These objects are thrown into a furance where each of them attains a temperature of `2000^(@)C`. Which object will glow brightest?

A

The white object

B

The black object

C

All glow with equal brightness

D

Gray object

Text Solution

Verified by Experts

The correct Answer is:
B
(2) Blackbody radiates maximum energy at the same temperature.
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CP SINGH-HEAT TRANSFER-Exercises
  1. For a perfectly black body, its abosrpitve power is

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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