Question

how can the time period of a pendulum be increased or decreased?

Answer 1

The time period of a pendulam is
T=2π√(l÷g)
where , l is the length of string of pendulam.
g is acceleration due to gravity.
as , g is constant on earth so
by changing the length (l) we can change the time period.
for increasing length the time period will increase.
for decreasing length the time period will decrease.

Answer 2

1. by increasing or decreasing the length of the string of the pendulum we can increase or decrease the time period of the pendulum

2. by changing the Temperature we can change the time period.

3. by changing the mass of Bob

4. by providing any external force

and many more other ways .....

hope you have understood
if you have any doubt reply me back I will solve your doubts