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Which of the following is the example of...

Which of the following is the example of ideal black body?

A

Kajal

B

Blackboard

C

A pin hole in a box

D

none of these

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The correct Answer is:
C
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NARAYNA-TRANSMISSION OF HEAT-C .U .Q
  1. In a room containing air, heat can go from one place to another

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  2. The reflectance and emittance of a perfectly black body are rspectivel...

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  3. Wien's displacement law fails at .

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  4. A surface at temperature T(0)K receives power P by radiation from a sm...

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  5. Two circular disc A and B with equal radii are blackened. They are hea...

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  6. A solid at temperature T(1) is kept in an evacuated chamber at tempera...

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  7. The thermal radiation emited by a body is proportional to T^(n) where ...

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  8. A blackbody does not

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  9. In summer, a mild wind is often found on the shore of a clam river. Th...

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  10. A heater body emits radiation which has maximum intensity near the fre...

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  11. Radiation is passing through a transparent medium then .

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  12. The graph, shown in the adjacent diagram, represents the variation of ...

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  13. In which of the following process, convection does not take place pri...

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  14. If mass-energy equivalence is taken into account, when water is cooled...

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  15. A sphare II A cube III A thin circular plate All made of the same mate...

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  16. A beaker full of hot water is kept in a room and it cools from 80^(@)C...

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  17. In the following which statement is correct .

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  18. Infrared radiation is detected by

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  19. Which of the following is the example of ideal black body?

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  20. The earth radiates in the infra-red region of the spectrum. The spectr...

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