Period is 1/440s = 0.00227 to 3 significant figures.
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440 Hz = 440 s^(-1) = 2.272... x 10^(-3) s Hence in one minute . 2.272... x 10^)-3) x 60 = 0.13536346.... min
The period of an 8000 Hz sine wave is 0.125 milliseconds. (1/8000)
Frequency = reciprocal of period = 1/P = 1/0.008 = 125 Hz.
Period = 1 / frequency = 0.001 second.
0.02