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
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(d) Time period of pendulum doesn’t depends upon mass but it depends upon length (distance between point of suspension and centre of mass).
In first three cases length are same so $T = {T_1} = {T_2}$ but in last case centre of mass lowers which in turn increases the length. So in this case time period will be more than the other cases.
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