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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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The correct Answer is:
B
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MOTION-HEAT TRANSFER & THERMAL EXPANSION -EXERCISE - 1
  1. Which of the following qualities are best suited for cooking utensils ...

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

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

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  4. The cause of Fraunhoffer lines is

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

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  6. The rate of flow of heat through a metal bar of area of cross-section ...

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  7. In the steady state of temperature the flow of heat across the body de...

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

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

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  10. In which case does the thermal conductivity increase from left to righ...

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  11. A rod of 1 m length and area of cross-section 1 cm^2 is connected acr...

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  12. The unit of thermal conductivity is :

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

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  14. Two rods A & B are connected in series as shown in fig. the conductivi...

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  15. What is the equivalent conductivity of rods A & B –

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

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  17. One end of a 2.35m long and 2.0cm radius aluminium rod (K=235W.m^(-1)K...

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  18. A metallic rod is continuously heated at its two ends, the flow of hea...

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  19. Nature of thermal radiations is similar to the nature of -

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  20. Heat radiation exhibit the phenomenon of polarization which means that...

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