Motion of which of the following is not periodic?

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Beating of a drum

Rotation of the Earth on its axis

Revolution of Moon around the earth

Movement of a pendulum

answer is A.

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Detailed Solution

The beat of the drum is non-periodic
Motion that is repeated at regular intervals of time is known as periodic motion. A swing in motion, a rocking chair, a bouncing ball, a tuning fork vibrating, the Earth orbiting the Sun, and a water wave are all examples of periodic motion. The time interval for repetition, or cycle, of the motion, is referred to in each case as a period, and the frequency is the number of periods per unit of time. Because the time intervals between the beats are not constant, the swing of a pendulum, the hands of a clock, and the rotation of the Earth are all periodic motions at regular intervals. A kite without periodic motion.

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