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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

black board

C

a pin hole in a box

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
D
When light incident on pin hole, enters into the box and suffers successive reflection at the inner wall. At each reflection some energy is aborbed. Hence the ray once it enters the box can never come out and pin hole acts like a perfect black Body.
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NIKITA PUBLICATION-KINETIC THEORY OF GASES & RADIATION -MCQs (Perfectly black body, emmissive power and emmissivity)
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  2. The amount of heat energy radiated per second by a surface depends upo...

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  3. S.I unit of emissive power is

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  4. Below a list of four types of surfaces

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  5. The silver polishing the walls of a thermos bottle minimizes the trans...

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  6. The bulbs of two identical thermometers are coated one with lamp black...

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  7. By which of the following methods could a cup of hot tea loss heat whe...

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  8. A black body at high temperature emits thermal radiations of

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  9. A sphere, a cube and a thin circular plate, all having the same mass a...

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  10. A body, which emits radiations of all possible wavelengths, is known a...

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

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  12. An ideal Black-body at room temperature is thrown into a furnace. It i...

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  13. Which of the following statement is correct?

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  14. Which of the following law states that "good absorbers of heat are goo...

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  15. Emissive power of a perfectly black body

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  16. Three cubes of sides 1,2,3 cm are at constant temperature of 100^(@)C....

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  17. The emissive power of a sphere of area 0.07m^(2) is 0.5 k cal/m^(2)s. ...

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  18. A sphere of radius 50 cm is maintained at a constant temperature, radi...

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  19. A metal cube with each side 3 cm long emits 0.27 kcal in 100s. Then it...

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  20. The filament of an evacuated light bulb has a length 10 cm, diameter 0...

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