Answer:
The frequency of vibration will be unchanged.
Explanation:
The frequency of oscillation of a simple pendulum is given by
[tex]f = \dfrac{1}{2 \pi}\sqrt{\dfrac{g}{L}}[/tex]
where, [tex]g[/tex] is the acceleration due to gravity and [tex]L[/tex] is the length of the pendulum.
It can be seen from the formula that the frequency of the pendulum is independent of the mass.
Thus, the frequency of vibration will be same.