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The cause of Fraunhoffer lines is...

The cause of Fraunhoffer lines is

A

the diffraction of the sun rays by the moon.

B

the sun rays are completely cut off by the moon and only the rays emitted by the moon reach the earth

C

the rays from the chromosphere are stopped by the moon and only the rays from the photo sphere are able to reach the earth.

D

the rays from the photosphere are stopped by the moon and only the rays from the chromo sphere are able to reach the earth.

Text Solution

Verified by Experts

The correct Answer is:
D
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MOTION-HEAT TRANSFER & THERMAL EXPANSION -EXERCISE - 1
  1. During total solar eclipse Fraunhoffer's lines appear bright because -

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

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  3. The cause of Fraunhoffer lines is

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

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

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

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

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

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

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

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  11. The unit of thermal conductivity is :

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

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

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

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

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

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

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

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

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

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