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प्रश्न
Which of the following is an example of an ideal black body?
विकल्प
Kajal
Blackboard
A pinhole in a box
lamp-black
MCQ
उत्तर
A pinhole in a box
Explanation:
The light that strikes a pinhole enters the box and experiences many reflections on the inner wall. Energy is absorbed with each reflection to some extent. As a result, once the ray enters the box, it cannot exit, and the pinhole behaves exactly like a black body.
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