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Q .     You are given two spheres of same material and radii
`10` cm and `20` cm. They are heated to the same
temperature and placed in the same environment. The
ratio of their rates of cooling will be

BITSAT 2016
A

`1 : 2`

B

`2 : 1`

C

`1 : 4`

D

`4 : 1`

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