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Two planets move around the sun. The periodic times and the mean radii of the orbits are

Two planets move around the sun. The periodic times and the mean radii of the orbits are  T1 , T2and r1 ,r2 respectively. The ratio T1/T2 is equal to

(a)   ( r1 /r2 )1/2                      (b) r1 /r2

(c)     ( r1 /r2 )2                      (d) ( r1 /r2 )3/2

Answer: d

(27)

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