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A solid copper sphere (density =8900kgm^...

A solid copper sphere (density `=8900kgm^(-3)` and specific heat `C=390Jkg^(-1)K^(-1)`) of radius `r=10cm` is at an initial temperature `T_(1)=200K`. It is then suspended inside an chamber whose walls are at almost `OK`. Calculate the time required for the temperature of the sphere to drop to `T_(2)=100 K`, `sigma=5.67xx10^(-8)Wm^(-2)K^(-4)`.

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