1.

The total amount of heat energy received by the sphere of radius r is

A. 2 π R<sup>2</sup> S
B. 6 π R<sup>2</sup> S
C. 4 π R<sup>2</sup> S
D. π R<sup>2</sup> S
Answer» D. ‚âà√¨‚àö√ë R<sup>2</sup> S


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