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A solid sphere of radius 'R' density rho...

A solid sphere of radius 'R' density `rho` and specific heat 'S' initially at temperature `T_(0)` Kelvin is suspended in a surrounding at temperature 0K. Then the time required to decrease the temperature of the sphere from `T_(0)` to `(T_(0))/(2)` kelvin is (Assume sphere behaves like a black body)

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`00000.78`
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