Which of the following has the minimum absorptivity ?
Correct answer: A. Aluminium foil
- A. Aluminium foil
- B. Coal dust
- C. Refractory bricks
- D. Iron plates
Explanation
A bright aluminium foil surface reflects most incident radiation and therefore has very low absorptivity. Coal dust and refractory bricks are relatively dark or rough surfaces and absorb much more radiation.
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