A copper ball of 20 cm diameter is kept outside open to sky during summer. The ball is capable of receiving and emitting heat by radiation. Identify the satisfactory conditions from the following to treat the ball as a block body. I)    the emissivity and absorptivity of the ball should be equal to one II)   the reflectivity and transmissivity of the ball should be equal to zero III)  the ball should emit lesser the heat absorbed I only II only I and II only II and III only I, II and III

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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A copper ball of 20 cm diameter is kept outside open to sky during summer. The ball is capable of receiving and emitting heat by radiation. Identify the satisfactory conditions from the following to treat the ball as a block body.

I)    the emissivity and absorptivity of the ball should be equal to one

II)   the reflectivity and transmissivity of the ball should be equal to zero

III)  the ball should emit lesser the heat absorbed

I only

II only

I and II only

II and III only

I, II and III

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