Answer
As we know that the frequency (in Hertz) is the number of cycles completed in one second and the period is amount of time (in seconds) a signal need to complete one cycle.
Here we see that 6 cycles are completed in 3 seconds. This means 2 cycles are completed in one second, so
Frequency = 2 Hz
And we know the formula for Time period, which is
T = 1 / f
T = 1 / 2
T = 0.5 seconds
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