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Describe an experiment to show that a blackened surface is a better emitter of heat than a polished surface. - Physics

Short Note
Describe an experiment to show that a blackened surface is a better emitter of heat than a polished surface.
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Solution

Take two sheets of tin plates, one blackened and the other is polished brightly. Fix some drawing pins on the outer side of both sheets using wax. Fix these plates vertically at a very short distance apart. Place a Bunsen burner midway between them. When you light the burner you will observe that the pins from the black painted sheet start dropping while the pins on the polished surface remain in the same position for a much longer time.
Thus, we can conclude that the black surface is a better absorber of heat than the polished one.

Concept: Green House Effect
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APPEARS IN

Frank Class 9 Physics ICSE
Chapter 5 Heat
Transmission of Heat | Q 25 | Page 227
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