What is black body? - Heat Transfer

Q.  Which of the following sentences are correct for black body

(1) The black body is a hypothetical body
(2) The black body is a real body
(3) The black body is used as a standard of perfection against which the radiation characteristics of other bodies are compared
- Published on 11 Aug 15

a. sentences (1) and (2)
b. sentences (1) and (3)
c. sentences (2) and (3)
d. all the sentences (1), (2) and (3)

ANSWER: sentences (1) and (3)

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