The period of a 15MHz sine wave is 1 / 15MHz, or 0.066667 us, or 66 2/3 ns.
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The period of an 8000 Hz sine wave is 0.125 milliseconds. (1/8000)
10 Hz
The period of 1GHz is 1 ns. The waveform is irrelevant.
The period of 1 MHz is 1 microsecond. The waveform is irrelevant.
Frequency = 1 / period = 1 / 0.807 = 1.2392 Hz (rounded)