Riaz needs a box which can absorb the heat from the sun very fast but loses it very slowly. How should the outer and the inner surface of the box be coloured so that Riaz gets the best result?

Outer - Silver, Inner - Silver

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Outer - Black, Inner - Black

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Outer - Silver, Inner - Black

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Outer - Black, Inner - Silver

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Solution

The correct option is D
Outer - Black, Inner - Silver

The outer surface should be black as more heat from the sun should be absorbed.
The inner surface should be coated with silver so that most of the heat is retained in the box.

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Riaz needs a box which can absorb the heat from the sun very fast but loses it very slowly. How should the outer and the inner surface of the box be coloured so that Riaz gets the best result?

The correct option is D Outer - Black, Inner - Silver The outer surface should be black as more heat from the sun should be absorbed. The inner surface should be coated with silver so that most of the heat is retained in the box.

The correct option is D
Outer - Black, Inner - Silver

The outer surface should be black as more heat from the sun should be absorbed.
The inner surface should be coated with silver so that most of the heat is retained in the box.