The period of a simple pendulum,whose bob is a hollow metallic sphere,is $T$. The period is $T_1$ when the bob is filled with sand,$T_2$ when it is filled with mercury,and $T_3$ when it is half-filled with mercury. Which of the following is true?

  • A
    $T = T_1 = T_2 > T_3$
  • B
    $T = T_1 = T_2 < T_3$
  • C
    $T > T_3 > T_1 = T_2$
  • D
    $T_1 = T_2 = T_3 > T$

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