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Question
Why is a conical projection in front of the hole i.n Fen-y's blackbody?
Options
To avoid absorption of radiations
To avoid return of the radiations by reflection.
To avoid emission of radiations
For some reason other than those mentioned above
MCQ
Solution
To avoid return of the radiations by reflection.
Explanation:
The blackbody is the darkest at room temperature, and when placed in a furnace, it absorbs heat until it reaches the temperature of the furnace. After that, it emits all wavelengths of energy and appears bright.
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