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The period of a 261 Hertz sound wave is

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User Meike
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Period = 1/frequency.
Because the frequency is 261, 1/261 = the period :)
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User Dennis Sheil
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herz is a measurement for how many cycles of the wave occur per second, which in this case is 261. the period is the time it takes to complete 1 cycle, so if 261 cycles occur per second, one cycle occurs every 1/261 seconds

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