NEET 2002 Physics question

Which of the following is best close to an ideal black body :

(1)Black lamp
(2)Cavity maintained at constant temperatureCorrect
(3)Platinum black
(4)A lump of charcoal heated to high temp.

Answer: (2)

Solution

An ideal black body absorbs all radiation falling on it. Radiation entering a small hole in a cavity is reflected many times inside and is almost completely absorbed, so a cavity (as in Ferry's black body) maintained at constant

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Question ID VK-088951