Game:

Rad (2019)

Duration: 3:43

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A point source of heat of power \( P \) is placed at the center of a spherical shell of mean radius \( R \). The material of the shell has thermal conductivity \( k \). The temperature difference between the outer and inner surfaces of the shell is not exceed \( T \), the thickness of the shell should not be less than
(A) \( \frac{4 \pi k R^{2} T}{p} \)
(B) \( \frac{4 \pi k R^{2}}{T p} \)
(C) \( \frac{4 \pi R^{2} T}{k p} \)
(D) \( \frac{4 \pi R^{2} P}{k T} \)
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