define the term periodic motion give two examples of the periodic motion that can be used to measure time
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Periodic motion is a motion that repeats itself in a definite period of time. Example: Rotation of the earth around its axis, which takes 24 hours. Revolution of the earth around the sun which takes 365 days i.e. 1 year. Hope it helps
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Time Periodic Motion:
Waves that can be represented by sine curves are periodic. If the wave is propagated with a velocity v and has a wavelength λ, then the period T is equal to wavelength divided by velocity, or T= λ/v. The frequency f is the reciprocal of the period; thus, f = 1/T = v/λ.
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