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During total solar eclipse Fraunhoffer's...

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

A

emission

B

absorption

C

reflection

D

transmission

Text Solution

Verified by Experts

The correct Answer is:
B
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MOTION-HEAT TRANSFER & THERMAL EXPANSION -EXERCISE - 1
  1. From Kirchoff's law the ratio of emissive power and absorption power o...

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  2. The cause of Fraunhoffer lines is

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

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

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

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

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

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

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

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  10. The unit of thermal conductivity is :

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

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

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

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

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

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

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

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

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  19. If transmission power of a surface is 1/6 and reflective power is 1/3,...

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  20. Out of the radiations falling on surface of a body, 30% radiations are...

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