Question

defination of oscillations and period of oscillations

Answer 1

A periodic motion that repeats itself in a regular cycle is called oscillation.For example ,a sine wave,the side to side swing of a pendulum or the up and down motion of a spring with a weight.An oscillating movement is around an equilibrium poimt or mean value.It is also known as a periodic motion.
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Answer 2

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Oscillation:-

One complete to and fro motion of the object about its mean position.