Absorptivity of a perfect black body is unity. Which of the following has maximum absorptivity ?
Correct answer: D. Coke breeze
- A. Aluminium foil
- B. Refractory bricks
- C. Iron plate
- D. Coke breeze
Explanation
Coke breeze is a dark, carbonaceous material and absorbs radiation more strongly than reflective aluminium foil or lighter refractory and iron surfaces. Its absorptivity is therefore the highest among the listed choices.
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