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From Kirchoff's law the ratio of emissiv...

From Kirchoff's law the ratio of emissive power and absorption power of all bodies-

A

Are different

B

Is equal to emissive power of black body at same temperature.

C

Is equal to emissive power of white body.

D

Is equal to emissive power of black body at any temperature.

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Kirchoff's Law
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BANSAL-HEAT TRANSFER-Exercise
  1. Stars S(1) emits maximum radiation of wave length 420nm and the star S...

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  2. A black body calorimeter filled with hot water cools from 60^(@)C to 5...

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  3. From Kirchoff's law the ratio of emissive power and absorption power o...

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  4. If at temperature T, the emissive power and absorption power of a body...

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  5. During total solar eclipse Fraunhoffer's lines appear bright because -

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  6. A polished metal plate with a rough black spot on it is heated to abou...

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  7. The temperature of a body is increased by 50%. The amount of radiation...

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  8. Radius of a shere is R density is d and specific heat is s, Is is heat...

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  9. If a body at 27^(@)C emits 0.3 watt of heat then at 627^(@)C, it will ...

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  10. If the rate of emission of radiation by a body at temperature TK is E ...

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  11. A liquid takes 10 minutes to cool from 80^(@)C to 50^(@)C. The tempera...

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  12. A metallic sphere cools from 50^(@)C to 40^(@)C in 300 seconds. If the...

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  13. Two stars A and B radiate maximum energy at wave lengths 4000Å and 500...

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  14. Four rods with different radii r and length l are used to connect two ...

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  15. The heat is flowing through two cylinderical rods of same material. Th...

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  16. A rod of 1m length and area of cross-section 1cm^(2) is connected acro...

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  17. Two rods are connected as shown. The rods are of same length and same ...

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  18. A slab consists of two layers of different materials of the same thick...

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  19. Two identical square rods of metal are welded end to end as shown in f...

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  20. Two rods of length d(1) and d(2) and coefficients of thermal conductiv...

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