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Which of the following is more close to a black body?

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Which of the following is more close to a black body?

(a) Blackboard paint

(b) Green leaves

(c) Black holes

(d) Red roses

I got this question at a job interview.

This interesting question is from Thermal Conduction in section Mechanical Properties of Solids of Engineering Physics I

1 Answer

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Best answer
Correct choice is (a) Blackboard paint

Best explanation: Blackboard paint is close to a black body. A good absorber is a good emitter but a black hole does not emit all radiations.

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