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The best laboratory approximation to an ...

The best laboratory approximation to an ideal black body is .

A

lump of charocoal heated to high temperature

B

a glass surface coated with coal tar

C

a metal coated with black dye

D

a hollow enclosure blackened inside with lamp black and have a small hole

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The correct Answer is:
D
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NARAYNA-TRANSMISSION OF HEAT-C .U .Q
  1. At high temperature black body spectrum is .

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  2. A black body emits

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  3. The best laboratory approximation to an ideal black body is .

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  4. A black body does not .

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  5. If the amount of heat energy received per unit area from the Sun is me...

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  6. The colour of a star is a measure of its .

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

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  8. If 'p' calorie of heat energy is incident on a body and absorbs 'q' ca...

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  9. The velocity of heat radiation in vacuum is .

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  10. Distribution of enrgy in the spectrum of a black body can be correctly...

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  11. Four pieces of iron are heated to different are respectively red, yell...

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  12. A star which appears blue will be

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  13. If a star is colder than the Sun it appears

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  14. The amount of radiation emitted by a perfectly black body is proportio...

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  15. At a given temperature the ratio between emissive power and absorptive...

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  16. If the sun become twice hotter it will radiate .

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  17. Three identical shperes of different meterials iron gold and silver ar...

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  18. Cooling graphs are drawn for three liquids a,b and c The specific heat...

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  19. A black body of temperature T is inside a chamber of temperature T(0) ...

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  20. The rate of cooling of a body is .

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