Answers

2016-03-02T20:13:56+05:30
Time period =  \frac{1}{frequency }

there fore the audible range = 1/20 to 1/20000
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2016-03-02T20:14:22+05:30
A period tells you how much time it takes for something (sound wave in this example) to complete it's full cycle, and frequency tells you how many cycles you get in 1 sec. So with some thinking you find out that T=1f T - time period f - frequency
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