A solid sphere of specific gravity $27$ has a concentric spherical cavity and it just sinks in water. The ratio of cavity radius to that of outer radius of sphere is
A solid sphere of specific gravity $27$ has a concentric spherical cavity and it just sinks in water. The ratio of cavity radius to that of outer radius of sphere is
- A
$\frac{{{{\left( {28} \right)}^{1/3}}}}{3}$
- B
$\frac{{{{\left( {30} \right)}^{1/3}}}}{3}$
- C
$\frac{{{{\left( {26} \right)}^{1/3}}}}{3}$
- D
$\frac{{{{\left( {24} \right)}^{1/3}}}}{3}$
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