Describe an experiment to compare the energy radiated by two surfaces at different temperatures

Describe an experiment to compare the energy radiated by two surfaces at different temperatures

• A metal cube whose sides have a variety of finishes; dull black, white, highly polished is filled with water and this water is kept boiling by a constant heat supply.
• A thermopile is made to face the various finishes of the cube at equal distances and each time the deflection on the galvanometer is noted.
• The deflection of the galvanometer is greatest when the thermopile is facing the dull-black surface and least when facing the highly polishes surface.
• This implies that the dull-black surface is a better radiator.

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