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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

Grey object

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SL ARORA-Thermal Properties of Matter-Exercise
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  2. PERFECTLY BLACK BODY

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

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  4. The rate of cooling at 600 K, if surrounding temperature is 300 K is R...

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  5. A body initially at 80^(@)C cools to 64^(@)C in 5 minutes and to 52^(@...

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  6. The temperature of a room heated by heater is 20^@C when outside tempe...

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  7. Emissive power of a perfectly black body

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  8. Which of the following statements is wrong ?

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  9. Unit of Stefan's constant is

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  10. Two bodies are at temperature 27^(@) and 927^(@)C. The heat energy rad...

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  11. A black body radiates energy at the rate of 1 xx 10^(5) J // s xx m at...

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  12. Temperature of a black body increases from 327^(@)C to 927^(@)C, the ...

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  13. Two identical metal balls at temperature 200^(@)C and 400^(@)C kept in...

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  14. A body at a temperature of 727^(@)C and having surface area 5 cm^(2), ...

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  15. The surface temperature of the sun is 'T'K and the solar constant for ...

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  16. A piece of blue glass heated to a high temperature and a piece of red ...

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  17. Which of the following graphs correctly represents the relation betwe...

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  18. How is the temperature of stars determined by

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  19. The wavelength of radiation emitted by a body depends upon

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  20. Temperature of two stars are in the ratio 3 : 2 . If wavelenghth for t...

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