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A sphere of solid material of relative density 9 has a concentric spherical cavity and sinks in water. If the radius of the sphere be R. Then the radius of the cavity (r) will be related to R as

A

`r^3 = 8/9 R^3`

B

`r^3 = 2/3 R^3`

C

`r^3 = (sqrt 2)/3 R^3`

D

`r^3 = sqrt (2/3) R^3`

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