A sound wave has a frequency of 4 Hz. What is the time period.
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then the frequency is 4 Hz; each drum must endure for one-fourth a second, so the period is 0.25 s.
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If the woodpecker drums upon a tree 4 times in one second, then the frequency is 4 Hz; each drum must endure for one-fourth a second, so the period is 0.25 s.
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