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A solid copper sphere (density rho and s...

A solid copper sphere (density rho and specific heat c) of radius r at an initial temperature `200K` is suspended inside a chamber whose walls are at almost `0K.` The time required for the temperature of the sphere to drop to 100K is …….

A

`(72)/(7)(r rhoc)/(sigma)`

B

`(7)/(72)(r rhoc)/(sigma)`

C

`(27)/(7)(r rhoc)/(sigma)`

D

`(7)/(27)(r rhoc)/(sigma)`

Text Solution

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The correct Answer is:
B
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