Home Physics Transmission of Heat Radiation (General, Kirchoff's Law, Black Body) Which of the following is the example of ide…
Physics Transmission of Heat Radiation (General, Kirchoff's Law, Black Body) MCQ (Single Correct)

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

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Verified by Experts
The correct answer is:
C

When light incident on pin hole, enters into the box and suffers successive reflection at the inner wall. At each reflection some energy is absorbed. 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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