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WHICH OF THE FOLLOWING IS MORE CLOSE TO A BLACK BODY?
(A) BLACK BOARD PAINT (B) BLACK HOLE
(C) GREEN LEAVES (D) RED ROSES
[AIEEE 2002] EXPLAIN ALSO.
(A) because its absorptivity, and therefore, its emissivity is higher than (c) and (d), and a black hole does not emit anything other than Hawking radiation.
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