how can a period of a pendulum be increased?

i suppose the easiest way to answer the question would be to evaluate the equation for the period (T) of a pendulum:

T = 2 * pi * sqrt (L/g)

T-period

sqrt-square root

L-length of pendulum

g-gravity (at your particular location)

so, to increase the period, you can either increase the the length of the pendulum or decrease the surrounding acceleration related to gravity (for example, take your pendulum to the moon).

Increase the length of the pendulum. I.E. if u r using a simple weight and string pendulum, lengthening the string between the attachment, and the weight will allow a longer period of arc.

Increase the length of the pendulum arm. The longer it is, the longer it takes to get from side to side.

by increasing its effective length

or by decresing acceleration acting upon it