A planet of radius \( R \) has a time period of revolution \( T \). Find the time period of a pl...

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A planet of radius \( R \) has a time period of revolution \( T \). Find the time period of a planet of radius \( 9 R \).
(a) \( 3 \sqrt{3} T \)
(b) \( 9 T \)
(c) \( 27 T \)
(d) \( 9 \sqrt{3} T \)
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