Question

why doesn't mass of bob affect pendulum time period??

Answer 1

Dear Student
Time period is given by
$$\begin{gathered} T=2\mathrm{\pi }\sqrt{\frac{\mathrm{L}}{\mathrm{g}}} \\ \mathrm{Where}\mathrm{L}\mathrm{is}\mathrm{length}\mathrm{and}\mathrm{g}\mathrm{is}\mathrm{acceleration}\mathrm{due}\mathrm{to}\mathrm{gravity} \end{gathered}$$

As in formula mass is not there, so it don't affect time period.

Regards