Question

Who am I ?
I am the reciprocal of time period of a wave.

Answer 1

Answer:

The period is the duration of time of one cycle in a repeating event, so the period is the reciprocal of the frequency. For example: if a newborn baby's heart beats at a frequency of 120 times a minute, its period, T, — the time interval between beats—is half a second (60 seconds divided by 120 beats).

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Answer 2

Answer:

frequency of sound wave is the reciprocal of time period of wave.