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10 Hz
The period of an 8000 Hz sine wave is 0.125 milliseconds. (1/8000)
The period of a 15MHz sine wave is 1 / 15MHz, or 0.066667 us, or 66 2/3 ns.
Period = 1/78.6 seconds = 0.01272 seconds
The period of 1GHz is 1 ns. The waveform is irrelevant.