What is the meaning of periodic change? Give examples.

A periodic change is a change that repeats itself after a regular time interval. These changes happen again and again in the same pattern and are predictable. One common example is the rising and setting of the sun every day. Another example is the swinging of a pendulum or the motion of the Earth around the sun, which causes seasons. 

These changes are called periodic because they happen in a fixed cycle or time period.

Examples of periodic change:

• Day and night
• Phases of the moon
• Beating of the heart
• Motion of a pendulum

Such changes help scientists study natural processes and keep track of time. Periodic changes are very useful in science and daily life.