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Two objects A and B have same shape and ...

Two objects A and B have same shape and area. The Emissivity of A is 0.2 and that of B is 0.8. Each radiates same power. The ratio of their absolute temperatures is

A

`2:1`

B

`1:4`

C

`1:sqrt2`

D

`sqrt2:1`

Text Solution

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The correct Answer is:
D
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AAKASH SERIES-THERMAL PROPERTIES OF MATTER-EXERCISE-2
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  3. If reflecting and transmitting powers of a body are 0.2 and 0.3 units,...

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  4. If the temperature of a Black body increases by 50% then amount of rad...

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  6. The rate of emission of radiation of a black body at temperature 27^(@...

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  7. The radiation emitted by a star A is 10,000 times that of the sun. If ...

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  8. The rectangular surface of area 8cmxx4cm of a black body at a temperat...

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  9. Two objects A and B have same shape and area. The Emissivity of A is 0...

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  10. A Black metal foil receives radiation of power P from a hot sphere at ...

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  11. If wavelengths of maximum intensity of radiations emitted by the sun a...

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  12. The wavelength of maximum energy released during an atomic explosion w...

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  13. If the maximum intensity of radiation for a black is found at 2.65 mu ...

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  14. The wavelength of maximum emitted energy of a body at 700K is 4.08 um ...

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  15. A hot body is placed in cooler surroundings. When the body temperature...

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  16. Certain quantity of water cools from 70^(@)C to 60^(@)C in the first 5...

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  17. A body cools from 70^(@)C to 50^(@)C in 5 minutes. Temperature of surr...

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  18. A body at 50^(@)C cools in a surroundings maintained at 30^(@)C. The t...

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  19. A brass rod and a copper rod have same difference in length at all tem...

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

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