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A sphere of solid material of relative d...

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) = 9/9 R ^(3)`

B

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

C

`r ^(2) = (sqrt 8)/(9) R ^(3)`

D

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

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The correct Answer is:
A
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